The estimated number of people in the city who spend between 10 - 14 hours a week on social media, is 24, 187 people .
How to find the estimated number of people ?The survey showed that 90 people out of 350 would spend about 10 - 14 hours a week on social media. In percentage terms, this would be:
= 90 / 350 x 100 %
= 25. 7 %
The survey can be applied to the entire population of Sunrise, FL to find out the approximate number of people in the town who spend between 10 - 14 hours on social media. This number would be:
= Percentage shown by survey x Population
= 25. 7 % x 94, 060
= 24, 187 people
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The first part of the question is:
A survey showed that out of 350 people in Sunrise, FL, 90 people spend between 10 - 14 hours a week on social media.
Cruz purchased a large pizza for $14.10. It serves 6 people. What is the cost per serving?
$1.41 per serving
$2.35 per serving
$3.04 per serving
$8.46 per serving
The product of two rational numbers can always be written as
an irrational number.
a whole number.
an integer.
a fraction.
The product of two rational numbers can always be written as a fraction. The Option D is correct.
What can product of two rational numbers result in?The product of 2 rational numbers can not be written as either irrational or whole number. This is because it will be expressed as the ratio of two integers and the product of two ratios of integers will always result in another ratio of integers.
For example, if we multiply 3/5 & 2/7 (rational numbers), we get (3/5) x (2/7) = 6/35 which is also a rational number. Therefore, the product of two rational numbers will always be a rational number or a fraction.
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Interest is compounded every three months at Money Bank at an annual rate of 5. 5%. A new client opens an account with $7200. How much money will be in the account at the end of six years?
The money that will be in the account at the end of six years is $8,404.5
The initial deposit = P = $7200
Rate = r = 5.5% per year
Time = 6 years ( Compounded Quarterly)
As per the question, the compound interest calculation can be used to determine how much money will be in the account after six years. Compound interest may be thought of as the addition of the loan's interest to the deposit's principal amount. As a result, it is computed using the Principal plus any prior interest.
Using, the formula for compound interest is:
A = [tex]P(1 + r/n)^(nt)[/tex]
Substituting the values -
A = [tex]7200(1 + 0.055/4)^(4 x 6)[/tex]
A = [tex]7200(1.01375)^24[/tex]
A = 7200 x 1.1657
A ≈ 8,404.5
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The stem-and-leaf plot displays the amount of time, in minutes, that 10 players spent practicing their serving skills for an upcoming tennis tournament.
Part A: Calculate the mean, median, mode, and range for the data given. Show your work.
Part B: Should the tennis players report the mean or median value to show they have practiced enough for the tournament? Explain based on the scenario.
The mean of the stem leaf plot is 29.09, median is 29 , range is 46 and mode is 41.
The data from stem leaf plot is 19, 22,26, 29,30,31,41,41,43,52,6
Mean = (19 + 22 + 26 + 29 + 30 + 31 + 41 + 41 + 43 + 52 + 6) / 11
Mean = 320 / 11
Mean = 29.09
To find median let us arrange the data in ascending order
6, 19, 22, 26, 29, 30, 31, 41, 41, 43, 52
So the median of the data is 29.
To find the mode of the data, we need to find the value that appears most frequently.
Mode is 41
To find the range of the data, we need to subtract the smallest value from the largest value:
So the range of the data is 46.
The tennis players should report the median value to show they have practiced enough for the tournament, as it is a more robust measure of central tendency for this dataset.
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Your goal is to find a better procedure for microwaving a bag of popcorn to cook the best in terms of proportion of popped kernels) popped bag. You plan to design an experiment to determine which bran
Make sure to keep all other variables constant, such as the brand and size of the popcorn bag, the amount of oil and seasoning used, and the type of microwave used.
1. Select multiple brands of microwave popcorn to test in the experiment.
2. For each brand, follow the recommended cooking instructions found on the packaging. This will serve as the control group.
3. Next, for each brand, design alternative microwaving procedures, such as adjusting the cooking time, using different power settings, or including a pre-heating step.
4. Randomly assign these alternative procedures to different bags of each brand, ensuring that you have at least one bag per procedure per brand.
5. Microwave each bag following its assigned procedure.
6. After microwaving, carefully count the number of popped kernels and unpopped kernels in each bag.
7. Calculate the proportion of popped kernels for each bag by dividing the number of popped kernels by the total number of kernels (popped and unpopped).
8. Compare the results for each procedure within each brand and identify which procedure yields the highest variable proportion of popped kernels.
9. Further, compare the results across all brands to determine if any particular procedure is consistently effective for multiple brands.
By following this experimental design, you should be able to determine the most effective microwaving procedure for achieving the highest proportion of popped kernels in a bag of popcorn.
Complete Question:
Your goal is to find a better procedure for microwaving a bag of popcorn to cook the best in terms of proportion of popped kernels) popped bag. You plan to design an experiment to determine which brand to use, how long to cook each bag in the microwave and what power setting to use. Some reasonable ranges for the factors from past experience: Cooking time (3 and 5 minutes), Power levels on the microwave oven (settings 5 and 10) and Popcorn brand (Kroger or Orville) (1) What type of design of experiment you will suggest for this study. (ii) Do you suspect that the effect of any factor on the proportion of popped kernels may depend on the value of some other factor? If yes, how will you add such an effect in the model? (iii) You decide to include all possible two-factor interactions besides main effects. (a) Write down the statistical model and its assumptions. (b) What will be the minimum number of runs needed to perform the experiment based on the effects you have added to the model?
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Using the t tables, software, or a calculator, estimate the values asked for in parts (a) and (b) below.
a) Find the critical value of t for a 95% confidence interval with df = 24. t= ___(Round to two decimal places as needed.) b) Find the critical value of t for a 98% confidence interval with df = 79.
t= ___ (Round to two decimal places as needed.)
a) The critical value of t for a 95% confidence interval with df = 24 is approximately 2.064.
b) The critical value of t for a 98% confidence interval with df = 79 is approximately 2.626.
We have,
a) To find the critical value of t for a 95% confidence interval with
df = 24, we can use a t-table or a statistical calculator.
For a 95% confidence level and df = 24, we need to find the t-value corresponding to an alpha value of 0.05 (1 - confidence level).
Using a t-table or a statistical calculator, we find that the critical value of t for a 95% confidence interval with df = 24 is approximately 2.064.
b)
Similarly, for a 98% confidence interval with df = 79, we need to find the t-value corresponding to an alpha value of 0.02 (1 - confidence level).
Using a t-table or a statistical calculator, we find that the critical value of t for a 98% confidence interval with df = 79 is approximately 2.626.
Therefore,
a) The critical value of t for a 95% confidence interval with df = 24 is approximately 2.064.
b) The critical value of t for a 98% confidence interval with df = 79 is approximately 2.626.
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Mr tuyen uses 5/8 of a tank of gas each week to drive to and from his job. How many tanks of gas does Mr.tuyen
used in five weeks write your answer two different ways.
Mr. Tuyen uses 25/8 or 3 1/8 (or 3 1/64) tanks of gas in five weeks.
As per the question,
Multiply the amount of gas used in one week (5/8 tank) by the number of weeks (5):
5/8 x 5 = 25/8 tanks of gas.
Simplify the fraction 25/8 by dividing the numerator and denominator by 8: 25/8 ÷ 8/8 = 25/64.
25/64 is an improper fraction, so we can convert it to a mixed number:
3 1/64 tanks of gas.
Alternative method:
In one week, Mr. Tuyen uses 5/8 of a tank of gas.
In five weeks, he uses 5/8 x 5 = 25/8 tanks of gas.
25/8 is an improper fraction, so we can convert it to a mixed number: 3 1/8 tanks of gas.
Therefore, Mr. Tuyen uses 25/8 or 3 1/8 (or 3 1/64) tanks of gas in five weeks.
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a football coach randomly selected the varisty or junior varsity team and then asks all players from that team their opinion on a new logo. the sample is a sample.
The given scenario describes an example of a cluster sampling technique.
The responses given by the players can be considered representative of the opinions held by the entire team.
The action taken by the football coach in selecting either the varsity or junior varsity team and asking for the opinion of all players on a new logo constitutes a randomly selected sample.
This means that the coach did not specifically choose certain players or a particular group to provide feedback, but rather included all members of one of the two teams.
Therefore, the responses given by the players can be considered representative of the opinions held by the entire team.
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A random sample of size 15 is taken from a population, and a 95% confidence interval for the population mean is calculated from the sample data to be (64.06, 66, 96). Which choice below gives the best interpretation of this interval?
(A) 95% of the population measurements lie within the interval.
(B) If many random samples of size 15 are taken from this population, then 95% of the time the population mean will lie within the interval.
(C) If many random samples of size 15 are taken from this population, then 95% of the time the sample mean will lie within the interval.
(D) If many random samples of size 15 are taken from this population, then 95% of the confidence intervals will contain the population mean.
(E) If many random samples of size 15 are taken from this population, then 95% of the confidence intervals will contain the sample mean.
(D) If many random samples of size 15 are taken from this population, then 95% of the confidence intervals will contain the population mean.
The best interpretation of the 95% confidence interval (64.06, 66.96) for the population mean, based on a random sample of size 15, is choice (B). This interpretation correctly states that if many random samples of size 15 are taken from the same population, then 95% of the time the population mean will lie within the interval. In other words, we can be 95% confident that the true population mean falls within this range based on the sample data. It is important to note that this does not mean that 95% of the population measurements lie within the interval (choice A), nor does it mean that 95% of the sample means will lie within the interval (choice C) or that 95% of the confidence intervals will contain the population mean (choice D) or the sample mean (choice E). These options are incorrect because they either misinterpret or generalize the confidence interval beyond its intended scope. Therefore, the best interpretation is the one that accurately reflects the meaning and purpose of a confidence interval.
(D) If many random samples of size 15 are taken from this population, then 95% of the confidence intervals will contain the population mean.
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A student is graduating from college in 12 months but will need a loan in the amount of $9,529 for the last two semesters. The student may receive either an unsubsidized Stafford Loan or a PLUS Loan. The terms of each loan are:
Unsubsidized Stafford Loan: annual interest rate of 5.95%, compounded monthly, and a payment grace period of six months from time of graduation
PLUS loan: annual interest rate of 6.55%, compounded monthly, with a balance of $10,172.23 at graduation
Which loan will have a lower balance, and by how much, at the time of repayment?
Answer:
To compare the balances of the two loans at the time of repayment, we need to calculate the future value of the loan amount for each loan option after 12 months of compounding.
For the Unsubsidized Stafford Loan:
Principal (P) = $9,529
Annual interest rate (r) = 5.95%
Compounding period (n) = 12 (monthly compounding)
Time period (t) = 1 year
Using the formula for future value of a loan (FV), we get:
The formula is:
FV = P * (1 + r/n)^(nt) = $9,529 * (1 + 0.0595/12)^(121) = $10,087.14
For the PLUS Loan:
Principal (P) = $10,172.23
Annual interest rate (r) = 6.55%
Compounding period (n) = 12 (monthly compounding)
Time period (t) = 1 year
Using the same formula, we get:
FV = P * (1 + r/n)^(nt) = $10,172.23 * (1 + 0.0655/12)^(121) = $10,774.71
Therefore, the Unsubsidized Stafford Loan will have a lower balance at the time of repayment, by $687.57 ($10,087.14 - $10,774.71).
Find the parallel line
It has been found that times taken by people to complete a particular tax form follow a normal distribution with a mean of 100 minutes and a standard deviation of 30 minutes. A random sample of nine people who have completed this tax form was taken. a) What is the probability that the sample mean time taken is less than 85 minutes?
The probability that the sample mean time taken is less than 85 minutes is 0.067 or 6.7%.
To answer this question, we can use the central limit theorem, which states that the distribution of sample means of a population with any distribution will approach a normal distribution as the sample size increases.
Given that the times taken to complete the tax form follow a normal distribution with a mean of 100 minutes and a standard deviation of 30 minutes, we can assume that the sample mean time taken also follows a normal distribution with a mean of 100 minutes and a standard deviation of 30 / sqrt(9) = 10 minutes (since the sample size is 9).
To find the probability that the sample mean time taken is less than 85 minutes, we need to standardize the sample mean using the formula z = (x - mu) / (sigma / sqrt(n)), where x is the sample mean, mu is the population mean, sigma is the population standard deviation, and n is the sample size.
Plugging in the values, we get z = (85 - 100) / (10) = -1.5.
We can then look up the probability of getting a z-score of -1.5 or lower in a standard normal distribution table or using a calculator. The probability is approximately 0.067 or 6.7%.
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how many ways are there for eight students and five professors to stand next to each other such that no two professors are standing next to each other
There are 8! (factorial) ways for the eight students to stand next to each other. However, since no two professors can stand next to each other, we need to alternate professors and students. We can start with a professor, then a student, then a professor, and so on.
There are 5! ways to arrange the five professors among the eight spaces where a professor can stand. Once the professors are arranged, there are 8 - 5 = 3 spaces left for students to stand. There are 8P3 (permutations) ways to arrange the three students among the three spaces.
Therefore, the total number of ways for eight students and five professors to stand next to each other such that no two professors are standing next to each other is 5! * 8P3 = 5,760 ways.
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Match each dilation to its correct function as it relates to the parent function(x)=x².
Nex
Instructions
uestion
j(x)=(1/2x)^2
k(x) = 2x²2
h(x)-(2x)²
g(x) = x²
horizontal compression
vertical compression
vertical stretch
horizontal stretch
The correct match of each dilation to its function is: j(x) = (1/2x)^2: vertical stretch, k(x) = 2x²: vertical compression, h(x) = (2x)²: horizontal compression, and g(x) = x²: no dilation, it is the parent function.
Each of the given functions is a dilation of the parent function f(x) = x^2, which means that they are obtained by stretching or compressing the graph of the parent function either vertically or horizontally.
- j(x) = (1/2x)^2: This function is a vertical stretch of the parent function, because the constant factor of 1/2 in front of the x causes the function to be stretched vertically by a factor of 2.
- k(x) = 2x²: This function is a vertical compression of the parent function, because the constant factor of 2 in front of the x^2 causes the function to be compressed vertically by a factor of 1/2.
- h(x) = (2x)²: This function is a horizontal compression of the parent function, because the constant factor of 2 inside the x^2 causes the function to be compressed horizontally by a factor of 1/2.
- g(x) = x²: This is the parent function, and it is not dilated in any way. Its graph is a parabola that opens upwards and has a vertex at the origin.
Thus, this is the correct match for the given scenario.
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A transportation authority conducts a survey of users of a commuter railroad. A random sample of passengers is selected, and each passenger in the sample is given a questionnaire. There are two questions on the questionnaire. The first question asks whether the passenger paid for the journey at the ticket office. using a machine located on the platform, or online. The second question asks how happy the passenger is with the transportation service (very happy, happy, neutral, or unhappy). A hypothesis test will be conducted to determine whether there is a association between the method of payment and happiness with the service. The test will use a chi-square distribution with k degrees of freedom. What is the value of k?
The value of k, or the degrees of freedom for this hypothesis test, is 6.
The value of k in this scenario would depend on the number of categories or levels for each of the variables being tested. Since the first question has three possible answers (ticket office, platform machine, online), and the second question has four possible answers (very happy, happy, neutral, unhappy), the degrees of freedom would be (3-1) x (4-1) = 6. Therefore, the chi-square distribution used in the hypothesis test would have 6 degrees of freedom.
To find the value of k, we need to determine the degrees of freedom for this chi-square test. The formula for calculating degrees of freedom in a chi-square test is:
k = (number of rows - 1) x (number of columns - 1)
In this case, the number of rows corresponds to the method of payment (ticket office, machine on the platform, or online), which gives us 3 rows. The number of columns corresponds to the levels of happiness (very happy, happy, neutral, or unhappy), which gives us 4 columns.
Using the formula:
k = (3 - 1) x (4 - 1)
k = 2 x 3
k = 6
The value of k, or the degrees of freedom for this hypothesis test, is 6.
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Use the given information to complete parts I and II. In your final answer, include all calculations. Mars has an approximate diameter of 6. 794 · 10 9 millimeters. The sun has a diameter of 1. 391 · 10 6 kilometers. Part I: Given that for every one kilometer there are 1,000,000 millimeters, which unit of measurement should be used to best represent the lengths of the sun and Mar's diameters?
Part II: Use estimation to approximate how many times greater the sun’s diameter is than planet Mars’s
The best unit of measurement to represent the diameters of Mars and the Sun is millimeters.
How to explain the measurement1 kilometer = 1,000,000 millimeters
Therefore, the Sun's diameter in millimeters can be calculated as:
1.391 × 10⁶ km × 1,000,000 mm/km = 1.391 × 10¹² mm
Sun's diameter / Mars's diameter = (1.391 × 10¹² mm) / (6.794 × 10⁹ mm)
This simplifies to:
Sun's diameter / Mars's diameter ≈ 204,474
Therefore, the Sun's diameter is approximately 204,474 times greater than Mars's diameter.
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If a basketball team has lost 50 matches out of the 120 matches played in total. Find out their winning percentage?
The winning percentage for this team is 58.33 percent.
How to find the winning percentage?The formula for this percentage is:
P = 100%*(number of games won)/total number of games.
The total number of games is 120, and of these the team lost 50, then the number of games won is:
120 - 50 = 70
Now we can replace these two values in the formula given above, then we will find that the winning percentage is:
P = 100%*(70/120)
P = 58.33%
That is the percentage we wanted.
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Two homebuyers are financing $137,000 to purchase a condominium. They obtained a 15-year, fixed-rate loan with a rate of 5.05%. They have
been given the option of purchasing up to four points to lower their rate to 4.81%. How much will the four points cost them?
O $1,370
O $1,730
$4,580
O $5,480
The four points that the homebuyers are purchasing to lower their rate from 5.05% to 4.81% will cost them D. $5,480.
What are the points in loans?The points purchased for loans are charges that the borrower pays upfront to lower their interest rates.
Each point equals a percentage of the loan amount.
For example, four points on a $137,000 loan are 4 percent of the loan amount, or $5,480.
The loan amount for the purchase of the condominium = $137,000
Fixed interest rate = 5.05%
Loan period = 15 years
Loan option rate = 4.81%
Four points = $5,480 ($137,000 x 4%)
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e)
E
F
7
S
Statement
R
24
16
X+2
Reason
f)
Using the knowledge of similar triangles for the figure the value of x would be
12How to solve for xThe value of x is solved in a two column table as shown
Statement Reason
EF || RS given
EA / SA = FA / RA proportions of similar triangles are equal
24/16 = (7 + (x + 2)) / (x+2) substitution property of equality
24(x + 2) = 16(x + 9) simplifying
24x - 16x = 144 - 48 gathering like terms
8x = 96 division property of equality
x = 12
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Two different linear functions are shown in the table.
Which key feature is different for the two functions?
A.Domain B.Range C.End behavior D.Slope
The key feature that is different for the two functions is (d) the slope
Which key feature is different for the two functions?From the question, we have the following parameters that can be used in our computation:
Linear functions on a graph and a table
As a general rule
All linear functions have the same domain, the same range
The slope of the table is
Slope = (8 - 6)/(-8 + 4) = -1/2
The slope of the graph is
Slope = (2 + 1)/(0 - 1) = -3
This means that their slopes are different
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over which interval is the graph of y=cos(x) strictly increasing?
The solution is :
D. π < x < 2π, over this interval is the graph of y=cos(x) strictly increasing.
Given the function
y=cos(x)
Referring to the intervals [0, 2π].
It decreases from the interval [0, π ] and then starts increasing in the interval [π, 2π ]
Proving by taking derivative:
Taking derivative of the function, y=cos(x)
dy/dx = - sinx
In the interval [π, 2π ], sinx is negative i.e. sinx < 0.
Therefore
-sinx > 0
When, the derivative of a function is positive, then the function is strictly increasing.
So, the answer is:
D. π < x < 2π
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How to show the numbers 1/2 and 1/3 on the number line
Step-by-step explanation:
To represent 1 2/3 on a number line, we start by locating the integer 1 on the number line:
----|-----------|-----------|-----------|-----------|-----------|
-3 -2 -1 0 1 2
Next, we need to locate the fractional part 2/3 of a unit. To do this, we divide the interval between 1 and 2 into three equal parts, and then shade two of those parts:
----|-----------|-----------|-----------|-----------|-----------|
-3 -2 -1 0 1 2
1 4/3 5/3 2
Therefore, the point representing 1 2/3 on the number line is located at 5/3 units to the right of -1, as shown above.
Factor the polynomial. 5s5 − 15s3 − 25s
Answer:
5s(s4−3s2−5)
Step-by-step explanation:
Write an explicit formula for � � a n , the � th n th term of the sequence 8 , 40 , 200 , . . . 8,40,200,
The explicit formula for the nth term of the sequence 8, 40, 200, ..., is:
[tex]a_n = 8 \times 5^{(n-1)}[/tex]
To find the explicit formula for the nth term of the sequence 8, 40, 200, ..., we first notice that each term is obtained by multiplying the previous term by 5. That is:
a₁ = 8
a₂ = 5a¹ = 40
a₃ = 5a² = 200
a₄ = 5a³= 1000
...
In general, we can write:
[tex]a_n = 5a_n-1[/tex]
where n is the index of the term in the sequence.
Using the initial term a₁ = 8, we can use the recursive formula to find the value of any term in the sequence. However, to find an explicit formula for the nth term, we can use the formula for a geometric sequence, which is:
[tex]a_n = a_1 \times r^{(n-1)}[/tex]
where r is the common ratio. In this case, the common ratio is 5, so we can substitute it into the formula to get:
[tex]a_n = 8 \times 5^{(n-1)}[/tex]
The explicit formula for the nth term of the sequence 8, 40, 200, ..., is:
[tex]a_n = 8 \times 5^{(n-1)}[/tex]
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Other than translation, what transformation is used to create this frieze pattern?
180° rotation
vertical reflection
horizontal reflection
glide reflection
The transformation to create the pattern is 180° rotation
Given data ,
Let the pattern be represented as figure A
Now , the figure A has footprints of the left leg
when rotating by 180° in the clockwise or anticlockwise direction , the sign only changes and it will be up side down
Hence , the transformation is 180° rotation
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if x+y= Z/2
& x-y=zero so..
a) Z = 2xy
b) y = 2z-4y
c) 2x = 2z
d) 2x = z-2y
Answer:
D
Step-by-step explanation:
x + y = [tex]\frac{z}{2}[/tex]
multiply through by 2 to clear the fraction
2x + 2y = z ( subtract 2y from both sides )
2x = z - 2y
interpretation trevor conducted a study and found that the correlation between the price of a gallon of gasoline and gasoline consumption has a linear correlation coefficient of 0.7. what does this result say about the relationship between price of gasoline and consumption? the study included gasoline prices ranging from $2.70 to $5.30 per gallon. is it reliable to apply the results of this study to prices of gasoline higher than $5.30 per gallon? explain.
Therefore, further research would be needed to determine if the relationship between the price of gasoline and gasoline consumption holds at higher prices.
A linear correlation coefficient of 0.7 indicates a strong positive linear relationship between the price of gasoline and gasoline consumption. In other words, as the price of gasoline increases, gasoline consumption also tends to increase. However, correlation does not necessarily imply causation, and there may be other factors at play that influence gasoline consumption.
It is not necessarily reliable to apply the results of this study to prices of gasoline higher than $5.30 per gallon because the study only included gasoline prices within that range. Extrapolating the results beyond the range of data may lead to inaccurate predictions or conclusions. Additionally, there may be other factors at play at higher prices that were not present within the range of prices studied.
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−15y^4 =(D)(3y^2 ) help is about Factor monomials
The Factor monomials of the -15[tex]y^4[/tex] = (D)(3y²) is -15[tex]y^4[/tex] = -5y² × 3y² or -15[tex]y^4[/tex] = -15y² × y², and the value of D could be 5 or -15 depending on simplification.
To factor the monomial -15[tex]y^4[/tex] as the product of two monomials, one of which is D and the other is 3y², we need to determine what constant D is.
To do this, we can divide -15[tex]y^4[/tex] by 3y², which gives us -5y². Therefore, we can write:
-15[tex]y^4[/tex] = (D)(3y²)
-5y^2 = D
So, the factored form of -15[tex]y^4[/tex] is:
-15[tex]y^4[/tex] = -5y² × 3y²
or
-15[tex]y^4[/tex] = -15y² × y²
Note that either way of writing the factored form is correct, as the order of the factors in a multiplication does not matter.
We divide the monomial by one of the factors, then use the quotient as the constant in the other factor to factor the monomial as the product of two monomials.
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suppose that in the past, 94% of all hispanic grocery shoppers were women. perhaps due to changing cultural values, we believe that more hispanic men are now grocery shopping. we randomly sample 689 hispanic grocery shoppers from around the united states and 606 are women. does this result provide enough evidence to conclude that a lower proportion of hispanic grocery shoppers now are women? test at alpha
Therefore, we can conclude that the changing cultural values have resulted in more Hispanic men grocery shopping by -3.81 percent.
To determine if a lower proportion of Hispanic grocery shoppers are women, we need to perform a hypothesis test using the given sample data.
Let p be the true proportion of Hispanic grocery shoppers who are women. The null hypothesis is that p = 0.94, while the alternative hypothesis is that p < 0.94. We will use a one-tailed test with a significance level of α = 0.05.
The test statistic is calculated as:
z = (x - np) / √(np(1-p))
where x is the number of women in the sample (606), n is the sample size (689), and p is the null hypothesis value (0.94).
z = (606 - 6890.94) / √(6890.94*0.06)
z = -3.81
The critical value for a one-tailed test with α = 0.05 and degrees of freedom of 688 is -1.645. Since the calculated z value of -3.81 is less than the critical value of -1.645, we reject the null hypothesis and conclude that there is sufficient evidence to suggest that a lower proportion of Hispanic grocery shoppers are women.
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In 2001, the Gallup poll found that 81% of American adults believed that there was a conspiracy in the death of President Kennedy. In 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the assassination, and found that 634 believe there was a conspiracy ("Gallup news service," 2013). Do the data show that the proportion of Americans who believe in this conspiracy has decreased? Test at the 1% level.
According to the Gallup poll, the proportion of American adults who believe in conspiracy theory has decreased significantly since 2001.
To test whether the proportion of Americans who believe in the conspiracy surrounding the death of President Kennedy has decreased, we need to conduct a hypothesis test. Let us assume that the null hypothesis is that the proportion of Americans who believe in the conspiracy theory has remained the same or increased, while the alternative hypothesis is that the proportion has decreased.
Let p be the true proportion of American adults who believe in the conspiracy theory, and let p0 be the proportion in 2001 (81%). The sample proportion in 2013 is 634/1039=0.61. The sample size is sufficiently large (1039>30), so we can use the z-test.
The test statistic is:
z = [tex](p - p0) / \sqrt{[p0*(1-p0)/n]}[/tex]
= (0.61 - 0.81) / [tex]\sqrt{[0.81*(1-0.81)/1039]}[/tex]
= -11.08
At the 1% level of significance, the critical value for a two-tailed test is z* = 2.58. Since the test statistic (z = -11.08) is much smaller than the critical value (z* = 2.58), we reject the null hypothesis in favour of the alternative hypothesis. Therefore, the data provide strong evidence that the proportion of Americans who believe in the conspiracy theory surrounding the death of President Kennedy has decreased since 2001.
In conclusion, according to the Gallup poll, the proportion of American adults who believe in conspiracy theory has decreased significantly since 2001. The sample size is sufficiently large, and the z-test was used to reach this conclusion at the 1% level of significance.
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