Answer:
a. Qualitative
b. p is a random variable
c. Normal distribution
[tex]\mu_p = 0.82[/tex]
[tex]\sigma_p = 0.038[/tex]
d. [tex]P(p > 0.85) = 21.77 \%[/tex]
e. [tex]P(p < 0.75) = 3.28 \%[/tex]
Step-by-step explanation:
a. Suppose a random sample of 100 Americans is asked, "Are you satisfied with the way things are going in your life?" Is the response to this question qualitative or quantitative? Explain.
Since the question is "Are You Satisfied?" which is not a numeric value to be measured but rather satisfaction is a state of mind therefore, it is qualitative in nature.
b. Explain why the sample proportion, p, is a random variable. What is the source of the variability?
[tex]$ p = \frac{n}{N} $[/tex]
The sample proportion p represents a random variable as n number of favorable people may vary from N number of total population therefore, p is a random variable.
c. Describe the sampling distribution of p, the proportion of Americans who are satisfied with the way things are going in their life. Be sure to verify the model requirements.
The sampling distribution of p, the proportion of Americans who are satisfied with the way things are going in their life follows normal distribution if following conditions holds true.
n×p ≥ 5
n×p×(1 - p) ≥ 5
We have n = 100 and p = 0.82
100×0.82 ≥ 5
82 ≥ 5 (satisfied)
100×0.82(1 - 0.82) ≥ 5
14.76 ≥ 5 (satisfied)
The mean of the sample proportion p is
[tex]\mu_p = 0.82[/tex]
The standard deviation of the sample proportion p is
[tex]$ \sigma_p = \sqrt{\frac{p(1-p)}{n} } $[/tex]
[tex]$ \sigma_p = \sqrt{\frac{0.82(1-0.82)}{100} } $[/tex]
[tex]\sigma_p = 0.038[/tex]
d. In the sample obtained in part (a), what is the probability the proportion who are satisfied with the way things are going in their life exceeds 0.85?
[tex]P(p > 0.85) = 1 - P(p < 0.85)\\\\P(p > 0.85) = 1 - P(Z < \frac{p - \mu_p}{\sigma_p} )\\\\P(p > 0.85) = 1 - P(Z < \frac{0.85 - 0.82}{0.038} )\\\\P(p > 0.85) = 1 - P(Z < \frac{0.03}{0.038} )\\\\P(p > 0.85) = 1 - P(Z < 0.78)\\\\[/tex]
The z-score corresponding to 0.78 is 0.7823
[tex]P(p > 0.85) = 1 - 0.7823\\\\P(p > 0.85) = 0.2177\\\\P(p > 0.85) = 21.77 \%[/tex]
Therefore, there is 21.77% probability that the proportion who are satisfied with the way things are going in their life exceeds 0.85.
e. Would it be unusual for a survey of 100 Americans to reveal that 75 or fewer are satisfied with the way things are going in their life? Why?
n = 75 and N = 100
p = 75/100
p = 0.75
[tex]P(p < 0.75) = P(Z < \frac{p - \mu_p}{\sigma_p} )\\\\P(p < 0.75) = P(Z < \frac{0.75 - 0.82}{0.038} )\\\\P(p < 0.75) = P(Z < \frac{-0.07}{0.038} )\\\\P(p < 0.75) = P(Z < -1.84)\\\\[/tex]
The z-score corresponding to -1.84 is 0.03288
[tex]P(p < 0.75) = 0.03288\\\\P(p < 0.75) = 3.28 \%[/tex]
Since the probability is very low, therefore, it is indeed unusual for a survey of 100 Americans to reveal that 75 or fewer are satisfied with the way things are going in their life.
Fill in the table using this function rule.
Answer:
1, 2.2, 5.5, 10.2.
Step-by-step explanation: these are simplified to the nearest tenth
7. The mean age at first marriage for respondents in a survey is 23.33,
with a standard deviation of 6.13. For an age at first marriage of 33.44,
the proportion of area beyond the Z score associated with this age is
.05. What is the percentile rank for this score?
Answer:
[tex] \mu = 23.33, \sigma =6.13[/tex]
And for this case we are analyzing the value os 33.44 and we can use the z score formula given by:
[tex] z=\frac{X -\mu}{\sigma}[/tex]
And replacing we got:
[tex] z=\frac{33.44 -23.33}{6.13}= 1.649[/tex]
We know that the proportion of area beyond the Z score associated with this age is .05 so then the percentile would be: 95
Step-by-step explanation:
For this case we have the following parameters:
[tex] \mu = 23.33, \sigma =6.13[/tex]
And for this case we are analyzing the value os 33.44 and we can use the z score formula given by:
[tex] z=\frac{X -\mu}{\sigma}[/tex]
And replacing we got:
[tex] z=\frac{33.44 -23.33}{6.13}= 1.649[/tex]
We know that the proportion of area beyond the Z score associated with this age is .05 so then the percentile would be: 95
Suppose you pay a dollar to roll two dice. if you roll 5 or a 6 you Get your dollar back +2 more just like it the goal will be to find the amount of money you can expect to win or lose if you play this game 100 times. How many times would you win? how many times would you lose?
Answer:
(a)$67
(b)You are expected to win 56 Times
(c)You are expected to lose 44 Times
Step-by-step explanation:
The sample space for the event of rolling two dice is presented below
[tex](1,1), (2,1), (3,1), (4,1), (5,1), (6,1)\\(1,2), (2,2), (3,2), (4,2), (5,2), (6,2)\\(1,3), (2,3), (3,3), (4,3), (5,3), (6,3)\\(1,4), (2,4), (3,4), (4,4), (5,4), (6,4)\\(1,5), (2,5), (3,5), (4,5), (5,5), (6,5)\\(1,6), (2,6), (3,6), (4,6), (5,6), (6,6)[/tex]
Total number of outcomes =36
The event of rolling a 5 or a 6 are:
[tex](5,1), (6,1)\\ (5,2), (6,2)\\( (5,3), (6,3)\\ (5,4), (6,4)\\(1,5), (2,5), (3,5), (4,5), (5,5), (6,5)\\(1,6), (2,6), (3,6), (4,6), (5,6), (6,6)[/tex]
Number of outcomes =20
Therefore:
P(rolling a 5 or a 6) [tex]=\dfrac{20}{36}[/tex]
The probability distribution of this event is given as follows.
[tex]\left|\begin{array}{c|c|c}$Amount Won(x)&-\$1&\$2\\&\\P(x)&\dfrac{16}{36}&\dfrac{20}{36}\end{array}\right|[/tex]
First, we determine the expected Value of this event.
Expected Value
[tex]=(-\$1\times \frac{16}{36})+ (\$2\times \frac{20}{36})\\=\$0.67[/tex]
Therefore, if the game is played 100 times,
Expected Profit =$0.67 X 100 =$67
If you play the game 100 times, you can expect to win $67.
(b)
Probability of Winning [tex]=\dfrac{20}{36}[/tex]
If the game is played 100 times
Number of times expected to win
[tex]=\dfrac{20}{36} \times 100\\=56$ times[/tex]
Therefore, number of times expected to loose
= 100-56
=44 times
Find the coordinates of the vertices of the figure after a rotation of 180°.
Hey there! I'm happy to help!
First, let's see what the coordinates of each of these points are by counting the squares.
Vertex A is at (-3,-4).
Vertex B is at (1,-3).
Vertex C is at (1,1).
Whenever you rotate a figure 180° about the origin, you find the negative version of each number in the ordered pair. Basically (x,y) turns into (-x,-y) when you rotate a figure 180°.
Let's do this below!
A: (-3,-4)⇒(3,4)
B: (1,-3)⇒(-1,3)
C: (1,1)⇒(-1,-1)
These new coordinates match with the third option: A'(3,4), B'(-1,3), C'(-1,-1). Now you can find the coordinates of translated points!
I hope that this helps! Have a wonderful day!
If a hypothesis is not rejected at the 0.10 level of significance, it: a. may be rejected at the 0.05 level. b. must be rejected at the 0.025 level. c. must be rejected at the 0.05 level. d. will not be rejected at the 0.05 level.
Answer:
Option D - Will not be rejected at the 0.05 level.
Step-by-step explanation:
The significance level, which is denoted as "α", is a measure of the strength of the evidence that must be present in a sample before we can reject the null hypothesis and conclude that the effect is statistically significant. Now, this significance level must be determined before conducting an experiment.
Now, in the context of this question, the significance level is the probability of rejecting the null hypothesis when it is true. For example, a significance level of 0.05 means a 5% risk of concluding that a difference exists when there is no actual difference. Now, lower significance levels will indicate that we require stronger evidence before we can reject the null hypothesis.
Thus, if we don't reject at α = 0.1,we obviously will not reject at higher values.
Thus, looking at the options, we will not reject at 0.05 significance level.
Jeremy makes $57,852 per year at his accounting firm. How much is Jeremy’s monthly salary? (There are 12 months in a year.) How much is Jeremy’s weekly salary? (There are 52 weeks in a year.)
Answer:
Monthly: $4,821
Weekly: $1112.54
Step-by-step explanation:
Monthly
A monthly salary can be found by dividing the yearly salary by the number of months.
salary / months
His salary is $57,852 and there are 12 months in a year.
$57,852/ 12 months
Divide
$4,821 / month
Jeremy makes $4,821 per month.
Weekly
To find the weekly salary, divide the yearly salary by the number of weeks.
salary / weeks
He makes $57,852 each year and there are 52 weeks in one year.
$57,852 / 52 weeks
Divide
$1112.53846 / week
Round to the nearest cent. The 8 in the thousandth place tells use to round the 3 up to a 4 in the hundredth place.
$1112.54 / week
Jeremy makes $1112.54 per week
Key west,Florida to Seattle, Washington is 3,518 miles. If it takes 7hours and 15 minutes to fly there, what is the average speed ?
Answer:
485.24 miles per hour
Step-by-step explanation:
The required average speed of the flight is 485.25 miles per hour.
Given that,
Key west, Florida to Seattle, Washington is 3,518 miles. If it takes 7 hours and 15 minutes to fly there, what is the average speed is to be determined?
The average of the values is the ratio of the total sum of values to the number of values.
What is speed?Speed is defined as when an object is subjected to move, the distance covered by the object in a certain time interval is the speed of that object.
Total distance to fly = 3,518 miles
Total time = 7 hours 15 minutes = 7 + 15/60
= 7.25 hour
Speed = distance / time
= 3, 518 / 7.25
= 485.25 miles / hours,
Thus, the required average speed of the flight is 485.25 miles per hour.
Learn more about average here:
brainly.com/question/24057012
#SPJ2
How many places do you need to move the decimal to the left to write the number below in scientific notation?
A)13
B)7
C)14
D)12
Answer:
A) 1.3*10¹
B)7*10⁰ - Actually I am not very sure if it is required to write 10⁰. I normally don't write 10⁰ (When I solve problems in physics if the answer for example is 7 I just write 7 not 7*10⁰). But if you check on Google 10⁰ has been mentioned
C)1.4*10¹
D)1.2*10¹
Step-by-step explanation:
For any number when you express it in a scientific notation, You should make sure that the number (for example : X) X which is going to be multiplied with a power of 10 (for example:10³,10⁴10¹⁰ etc), X should be between 1 and 10
This might sound very complicated so I can give you an example to simplify
Let's take 1.3*10¹
In this case X is 1.3
This means X*10¹
The number X is being multiplied with the power of 10(example:10¹,10²,10⁰,10⁹ ,etc) .In the above case X is being multiplied with 10¹.
Now this number X should be between 1 and 10.(Including 1)
Scientific notation= X*power of 10
where x>=1 & x<10
That is the explanation
Hope it helps
If you think my explanation is a bit complicated
you can ask me again
An auto race consists of 15 laps. Jon Kimm completes the first 3 laps at an average speed of 195 mph, and the remaining laps at an average speed of 205 miles per hour. Let d represent the length of one lap. Choose the time in terms of d that it takes the driver to complete the race.
Answer:
equation is inconclusive
Step-by-step explanation:
you average the two speeds getting 200 mph. then you need to know the time is took to fully complete the race to get the unit rate which you would multiply to find yiur time.
Using traditional methods it takes 107 hours to receive an advanced flying license. A new training technique using Computer Aided Instruction (CAI) has been proposed. A researcher believes the new technique may reduce training time and decides to perform a hypothesis test. After performing the test on 50 students, the researcher decides to reject the null hypothesis at a 0.10 level of significance.
What is the conclusion?
A. There is sufficient evidence at the 0.020 level of significance that the new technique reduces training time.
B. There is not sufficient evidence at the 0.02 level of significance that the new technique reduces training time.
Answer:
B. There is not sufficient evidence at the 0.02 level of significance that the new technique reduces training time.
Step-by-step explanation:
We are given that using traditional methods it takes 107 hours to receive an advanced flying license.
A researcher believes the new technique may reduce training time and decides to perform a hypothesis test.
Let [tex]\mu[/tex] = average training time to receive an advanced flying license
So, Null hypothesis, [tex]H_0[/tex] : [tex]\mu \geq[/tex] 107 hours {means that the new technique doesn't reduce training time}
Alternate Hypothesis, [tex]H_A[/tex] : [tex]\mu[/tex] < 107 hours {means that the new technique may reduce training time}
Now, it is stated that after performing the test on 50 students, the researcher decides to reject the null hypothesis at a 0.10 level of significance.
As we know that if the test statistics value is rejected at a 10% level of significance, then it must not be rejected at the 0.02 level of significance.
This means that there is not sufficient evidence at the 0.02 level of significance that the new technique reduces training time because our null hypothesis has not been rejected.
Write an equation of a line that contains the point (-2,3) with a slope of 0.
Answer:
y =3
Step-by-step explanation:
Slope of zero means it is a horizontal line
Horizontal lines are of the form
y =
The y coordinate is 3 so
y =3
A 6-pound bag of wheat costs $47.04. What is the price per ounce?
Answer:
$0.49
Step-by-step explanation:
Using the conversion
1 pound = 16 ounces , then
6 pounds = 6 × 16 = 96 ounces, thus
cost of 1 ounce = [tex]\frac{47.04}{96}[/tex] = $0.49
Given a right triangle with a hypotenuse length of radical 26 and base length of 3. Find the length of the other leg (which is also the height).
Answer:
√17
Step-by-step explanation:
The Pythagorean theorem can be used for the purpose.
hypotenuse² = base² +height²
(√26)² = 3² +height²
26 -9 = height²
height = √17
The length of the other leg is √17.
A college student is taking two courses. The probability she passes the first course is 0.7. The probability she passes the second course is 0.67. The probability she passes at least one of the courses is 0.79. Give your answer to four decimal places. a. What is the probability she passes both courses
Answer:
0.58 = 58% probability she passes both courses
Step-by-step explanation:
We have two events, A and B.
[tex]P(A \cup B) = P(A) + P(B) - P(A \cap B)[/tex]
In which:
[tex]P(A \cup B)[/tex] is the probability of at least one of these events happening.
P(A) is the probability of A happening.
P(B) is the probability of B happening.
[tex]P(A \cap B)[/tex] is the probability of both happening.
In this question:
Event A: Passes the first course.
Event B: Passes the second course.
The probability she passes the first course is 0.7.
This means that [tex]P(A) = 0.7[/tex]
The probability she passes the second course is 0.67.
This means that [tex]P(B) = 0.67[/tex]
The probability she passes at least one of the courses is 0.79.
This means that [tex]P(A \cup B) = 0.79[/tex]
What is the probability she passes both courses
[tex]P(A \cup B) = P(A) + P(B) - P(A \cap B)[/tex]
[tex]0.79 = 0.70 + 0.67 - P(A \cap B)[/tex]
[tex]P(A \cap B) = 0.58[/tex]
0.58 = 58% probability she passes both courses
Based on past experience, it is predicted that 31% of registered voters in Oklahoma will vote in the next primary. The 31% would be considered an example of:
Answer:
Option D is correct.
The 31% would be considered an example of inferential statistics.
Step-by-step explanation:
Complete Question
Based on past experience, it is predicted that 31% of registered voters in Oklahoma will vote in the next primary. The 31% would be considered an example of:
A) Qualitative data
B) Descriptive statistics
C) A sample
D) Inferential statistics
Solution
Taking the options one at a time.
- Qualitative data is a dataset where the members of the dataset are grouped or represented according to some categorical condition or property. It is also called categorical data. It is normally non-numerical in nature. This is obviously not the correct answer.
- Descriptive Statistics are brief or summary statistics that summarize a given data set. Descriptive statistics are broken down into measures of central tendency and measures of dispersion or variability (the spread of the distribution about the mean). The 31% is a prediction using past datasets, it isn't a descriptive statistic to summarize all that is in the current dataset.
- A sample is a dataset that consists of variables picked from the population distribution. It is a smaller set of variables usually extracted from the population. This is also not the answer.
Inferential Statistics uses results from the past datasets or dataset using some other condition to obtain a predicted statistic for a current dataset or the dataset given current conditions.
From the question, the results from the old dataset (based on past experiences), is used to predict some statistic (percentage of registered voters in Oklahoma who will vote in the next primary). It is evident that this is the answer; 31% prediction for registered voters in Oklahoma will vote in the next primary, was made using past experience. Inferential Statistic.
Hope this Helps!!!
A musician plans to perform 5 selections for a concert. If he can choose from 9 different selections,
how many ways can he arrange his program?
Answer:
since order of songs matter in a concert as well, every scenario of the 5 songs being played in different order will be a different scenario.
so, we will permute 5 from 9.
9!/4!
15120 different scenarios
I the horizontal change between two points on a line.
Answer:
m = rise /run = (y2-y1)/(x2-x1)
Step-by-step explanation:
In math, slope is the ratio of the vertical and horizontal changes between two points on a surface or a line. The vertical change between two points is called the rise, and the horizontal change is called the run. The slope equals the rise divided by the run.
Answer: Run is the horizontal change between two points on a line.
Step-by-step explanation:
11/n = 8/5 solve for n
Answer:
n = 55/8
Step-by-step explanation:
You can solve it by cross multiplying. Where you multiply the denominator of the fraction on the left side with the numerator on the right side, and vice versa.
11/n = 8/5
n x 8 = 11 x 5
8n = 55
n = 55/8
(or 6.875)
Answer:
[tex]\boxed{\pink{n = 7 \frac{3}{8} }}[/tex]
Step-by-step explanation:
[tex] \frac{11}{n} = \frac{8}{5} \\ [/tex]
Use cross multiplication
[tex]11 \times 5 = 8 \times n \\ 55 = 8n \\ \frac{55}{8} = \frac{8n}{8} \\ n = 7 \frac{3}{8} [/tex]
Which of the following best describes the English expression the product of 2 and a number minus 11
Answer:
2x-11
Step-by-step explanation:
The product of something means multiplication, and since we are only given one number we can use the variable x to represent it. And minus 11 is obviously subtraction, so we can put together the expression 2x-11.
Write the slope-intercept form of the equation that passes through the point (1,5) and is perpendicular to the line y =-x + 3
Answer:
y = -1/7x - 23/7
Step-by-step explanation:
Step 1: Find slope m
m = (-4 + 3)/(5 + 2)
m = -1/7
y = -1/7x + b
Step 2: Find b
-3 = -1/7(-2) + b
-3 = 2/7 + b
b = -23/7
Step 3: Rewrite equation
y = -1/7x - 23/7
In a survey, 205 people indicated they prefer cats, 160 indicated they prefer dots, and 40 indicated they don’t enjoy either pet. Find the probability that if a person is chosen at random, they prefer cats
Answer: probability = 0.506
Step-by-step explanation:
The data we have is:
Total people: 205 + 160 + 40 = 405
prefer cats: 205
prefer dogs: 160
neither: 40
The probability that a person chosen at random prefers cats is equal to the number of people that prefer cats divided the total number of people:
p = 205/405 = 0.506
in percent form, this is 50.6%
If -5(x+8) =-25, then x=-3
Answer:
Correct!
Step-by-step explanation:
-5(x+8)=-25
x+8=5
x=-3
Answer:
here, -5(x+8)=-25
or, -5x +(-40)= -25
or, -5x=-25+40
or, x= 15/-5
therefore the value of x is -3....ans..
hope u understood..
ABC bank requires a 20% down payment on all its home loans. if the house is priced at $105,000, what is the amount of the down payment required by the bank?
A) $21,000
B) $210,000
C) $14,500
D) $18,000
correct answer is A) $21,000
Answer:
A) $21,000
Step-by-step explanation:
Percentage of down payment that ABC bank requires to be paid = 20%
Price of the house = $10500
Then
Amount of down payment
that needs to be made = (20/100) * 105000
= 21000 dollars
The answer is A) $21,000
20% is 1/5
1/5 of 105,000 is 21,000
When deriving the quadratic formula by completing the square, what expression can be added to both sides of the
equation to create a perfect square trinomial?
Answer:
The element you add is [tex]b^2 / 4a[/tex]
Step-by-step explanation:
The element you add is [tex]b^2 / 4a[/tex]
Remember that
[tex]a x^2 + bx +c \\= a ( x^2 +(b/a)x ) + c[/tex]
So, in order to complete the square you add [tex](b/2a)^2[/tex]
But when you multiply times [tex]a[/tex] you get
[tex]b^2 / 4a[/tex]
it can also be explained as D on edg if you still needed the answer :)
1) What is the square root of 81
The following data represent the miles per gallon for a particular make and model car for six randomly selected vehicles. Compute the mean, median, and mode miles per gallon 24.2. 22.2. 37.8, 22.7. 35 4. 31.61. Compute the mean miles per gallon. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The mean mileage per gallon is _______B. The mean does not exist 2. Compute the median miles per gallon. Select the correct choice below and, if necessary, fill in the answer box to complete your choice A. The median mileage per gallon is __________B. The median does not exist. 3. Compute the mode miles per gallon. Select the correct choice below and, if necessary,fill in the answer box to complete your choice. A. The mode is _________B. The mode does not exist.
Answer:
A. The mean mileage per gallon is _____ 28.99__
A. The median mileage per gallon is _____27.905_____
B. The mode does not exist.
Step-by-step explanation:
Mean= Sum of values/ No of Values
Mean = 24.2 + 22.2+ 37.8+ 22.7 + 35.4 +31.61/ 6
Mean = 173.91/6= 28.985 ≅ 28.99
The median is the middle value of an ordered data which divides the data into two equal halves. For an even data the median is the average of n/2 and n+1/2 value where n is the number of values.
Rearranging the above data
22.2 , 22.7 , 24.2 , 31.61 , 35.4, 37.8
Third and fourth values are =24.2 + 31.61 = 55.81
Average of third and fourth values is = 55.81/2= 27.905
Mode is the values which is occurs repeatedly.
In this data there is no mode.
Can someone plz help me solved this problem I need the other line which is X! I already have line y but I need X plz someone help i need help!
Answer: see below
Step-by-step explanation:
To sketch the graph of y = 2x + 4,
notice that this is in Slope-Intercept form of y = mx + b where
m is the slope and b is the y-intercept.
--> m = [tex]\dfrac{2}{1}[/tex] b = 4
Start on the y-axis and plot 4 (coordinate (0, 4)
From that point, count Up 2 and Right 1 to plot the next point (1, 6)
Draw a line through the points (0.4) and (1, 6).
Please help me in this
Answer:
the first question:a half is 1/2 = 0.5
10 perecent ⇒ (0.5*10)/100= 0.05
the second question :the percentage of 19⇒ (19*100)/20 = 95 percent
What is 10% of a half?
= 0.05
10% of 0.5 is 0.05.
Divide 0.5 by 10 and move the decimal point one place to the left.
---------------------------
What percentage of 20 is 19?
= 95%
Convert the fraction
Steps:
19/20 =
19 divided by 20 =
0.95
0.95 x 100/100 =
0.95 x 100% =
(0.95 x 100)% =
95%
Evaluate the expression (image provided). A.) 1.5 B.) 6 C.) 6^15 D.) 1.5^6
Answer:
1.5
Step-by-step explanation:
6 to the log base of 6 will be one (they essentially cancel each other out, log is the opposite of exponents) and we are left with 1.5.
Find the length and width of a rectangle that has the given perimeter and a maximum area. Perimeter: 116 meters
Answer:
Length = 29 m
Width = 29 m
Step-by-step explanation:
Let x and y be the length and width of the rectangle, respectively.
The area and perimeter are given by:
[tex]A=xy\\p=116=2x+2y\\y=58-x[/tex]
Rewriting the area as a function of x:
[tex]A(x) = x(58-x)\\A(x) = 58x-x^2[/tex]
The value of x for which the derivate of the area function is zero, is the length that maximizes the area:
[tex]A(x) = 58x-x^2\\\frac{dA}{dx}=0=58-2x\\ x=29\ m[/tex]
The value of y is:
[tex]y = 58-29\\y=29\ m[/tex]
Length = 29 m
Width = 29 m