Answer:
When two or more separate ratios have the same value.
A pharmaceutical company is conducting a study on whether or not their new vaccine is effective in preventing chicken pox. The researchers rejected the null hypothesis and stated that the vaccine was effective. However, subsequent studies found out that the vaccine did not have any effect on combating chicken pox. What type of error did the researchers make
Answer:
The answer is "Type 1 error".
Step-by-step explanation:
The error of type I, frequently known as a 'false positive': its error in judgment that perhaps a null hypothesis is simply rejected. This is the mistake of accepting a possible (actual interest hypothesis) hypothesis whenever the results could be attributed to chance since the researchers deny, if valid, the null hypothesis.
Use the multiplication principle to solve the problem.
A biologist is attempting to classify plant species by assigning 5 initials to each species. How many
classifications are possible using this method?
HELP PLEASE QUICK!!!!!
Answer:in what can I help
Step-by-step explanation:
Need help with finding the mean (MATH 7th GRADE)
Answer:
mean = 49.25
Step-by-step explanation:
mean = sum of all the number ÷ amount of number
mean = 56 + 21 +55 + 30 + 34+ 76 + 40 + 82 = 394 ÷ 8
mean = 49.25
mean absolute deviation = (56- 49.25) + (21 - 49.25) + (55 -49.25) + (30 - 49.25) + (34 -49.25) + (76 -49.25) + (40 - 49.25) + (82- 49.25) / 8
mad= 6.75 + -28.25 + 5.75 + -19.25 + -15.25 + 26.75 + -9.25 + 32.75 / 8
mad = 0/8
mad= 0
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Mike wants to find the confidence interval for a set of data. He knows the sample size and the sample proportion. Which other piece of information does he need to determine the confidence interval?
A.
the critical value
B.
the number of favorable responses
C.
the standard error of the mean
D.
the standard deviation
Answer:
C. the standard error of the mean
Step-by-step explanation:
You need the sample mean, sample proportion , and the standard error which depend on z or t, sigma or s, and n
A consulting firm claimed that 65% of all e-commerce shoppers fail in their attempts to purchase merchandise on-line because Web sites are too complex. The claim was tested by taking a random sample of 60 online shoppers and assigning them each a different randomly selected e-commerce Web site to test. 45 reported sufficient frustration with their sites to deter making a purchase. The data was entered into STATISTIX and the following output was generated:
Hypothesis Test - One Proportion
Sample Size 60
Successes 45
Proportion 0.75000
Null Hypothesis: P = 0.65
Alternative Hyp: P > 0.65
Difference 0.10000
Standard Error 0.05590
Z (uncorrected) 1.62 P 0.0522
Method 95% Confidence Interval
Simple Asymptotic (0.64043, 0.85957)
Which of the following statements is correct if we are testing at α = 0.05?
a. There is sufficient evidence to indicate that more than 65% of all e-commerce shoppers fail in their attempts to purchase merchandise on-line because Web sites are too complex.
b. There is sufficient evidence to indicate that exactly 65% of all e-commerce shoppers fail in their attempts to purchase merchandise on-line because Web sites are too complex.
c. There is insufficient evidence to indicate that exactly 65% of all e-commerce shoppers fail in their attempts to purchase merchandise on-line because Web sites are too complex.
d. There is insufficient evidence to indicate that more than 65% of all e-commerce shoppers fail in their attempts to purchase merchandise on-line because Web sites are too complex.
Answer:
b. There is sufficient evidence to indicate that exactly 65% of all e-commerce shoppers fail in their attempts to purchase merchandise on-line because Web sites are too complex.
Step-by-step explanation:
Not significant,accept null hypothesis that population proportion = 0.65
When we accept the null hypothesis that P= 0.65
Then only option b is correct which states that there is sufficient evidence to support that population proportion is exactly 0.65 .
1) We obtain a P - value of 0.0522 which is greater than 0.5 indicating that the null hypothesis is not rejected.
The rejection region for this right-tailed test is z > 1.64
2) Test Statistics
z= p`-p0/ sqrt(p0(1-p0)/n)
The z-statistic is computed as follows:
z= 0.75-0.65/ √(0.65*0.35)60
z= 1.624
3) Decision about the null hypothesis
Since it is observed that z = 1.624 is less than z ∝=1.64, it is then the null hypothesis is not rejected.
Find the area of the shape below
Answer:
2112
Step-by-step explanation:
100% sure
Mike wants to find the confidence interval for a set of data. He knows the sample size and the sample proportion. Which other piece of information does he need to determine the confidence interval?
A.
the critical value
B.
the number of favorable responses
C.
the standard error of the mean
D.
the standard deviation
Answer:
A
Step-by-step explanation:
The other piece of information Mike needs to determine the confidence interval is the critical value.
What is a confidence interval?A confidence interval is a range of estimates for a variable that is uncertain. A confidence interval is calculated at a specified confidence level; the 95% confidence level is the most frequent, although other values, such as 90%or 99%, are also used.
To determine the confidence interval for a set of data sample size, the sample proportion, and the critical value are needed to be known.
Hence, the other piece of information Mike needs to determine the confidence interval is the critical value.
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pls answer this question about math
Answer:
AB, AC, AD, BC, BD, CD
Hope this helps :)
Answer:
five line segment =AB,AC,AD,BC,BD,CD
Nicholas is currently in eighth grade and intends to attend a state college when he finishes high school. Nicholas’s parents currently have some money invested in mutual funds, but would like to invest this money in a more secure investment now to pay for college in 4 years. If they will need $25,000, how much do Nicholas’s parents have to invest now in a 48month CD that has a rate of 4.59% compounded monthly?
Answer:
30027.86
Step-by-step explanation:
12 less than a number is 39 find the number round your answer to the nearest integer if necessary
Answer:
number = n
n = 51
Equation:
n - 12 = 39
39 + 12 = 51
Which is not a correct way to rewrite this expression using the distributive
property?
(2x2 + 4x - 7)(x - 2)
A. (2x2 + 4 – 7)(x) + (2x2 + 4x - 7)(x - 2)
B. (2x2)(x) + (2x2)(-2) + (4x)(x) + (4x)(-2) + (-7)(x) + (-7)(-2)
C. (2x2)(x - 2) + (4x)(x - 2) + (-7)(x - 2)
D. (2x2 + 4x - 7)(x) + (2x2 + 4x - 7)(-2)
Given:
The expression is
[tex](2x^2+4x-7)(x-2)[/tex]
To find:
The expression which is not a correct way to rewrite the given expression.
Solution:
We have,
[tex](2x^2+4x-7)(x-2)[/tex]
Using distributive property, we get
[tex]=(2x^2)(x-2)+(4x)(x-2)+(-7)(x-2)[/tex]
[tex]=(2x^2)(x)+(2x^2)(-2)+(4x)(x)+(4x)(-2)+(-7)(x)+(-7)(-2)[/tex]
Using distributive property the given expression can rewritten as:
[tex]=(2x^2+4x-7)(x)+(2x^2+4x-7)(-2)[/tex]
Only the expression in option A is not a correct way to rewrite the given expression because [tex](2x^2+4x-7)[/tex] is not distributed to [tex](x-2)[/tex] properly.
Therefore, the correct option is A.
helpppppppppppppppppppppppppppp
Can someone help for number 17 I’ll mark best answer!!!!!!!!!!!
9514 1404 393
Answer:
a) radius: 6 (m); mass: 22 (kg)
b) volume: 19 (m³)
c) d ≈ 2.8×10^3 kg/m³
Step-by-step explanation:
The order of magnitude is the exponent of 10 when the number is written in scientific notation.
a) radius: 1.6×10^6 m, so the order of magnitude is 6 when the units are meters.
mass: 4.8×10^22 kg, so the order of magnitude is 22 when the units are kg.
__
b) The volume is ...
V = (4/3)πr^3 ≈ 1.716×10^19 m^3, so the order of magnitude of the volume is 19 when the units are m^3.
__
c) The ratio of mass to volume is ...
d = (4.8×10^22)/(1.716×10^19) ≈ 2.8×10^(22-19) = 2.8×10^3 kg/m^3, so the order of magnitude is 3 when the units are kg/m^3.
Please help me I am struggling
Answer:
924
Step-by-step explanation:
i multiply 14 by 11 and then by 6
How are theoretical probability and experimental probability related
Answer:
Experimental probability is the result of an experiment. Theoretical probability is what is expected to happen. Three students tossed a coin 50 times individually.
Step-by-step explanation:
Experimental probability is found through experiments while theoretical probability are not.
What is Probability?Probability is simply the possibility of getting an event. Or in other words, we are predicting the chance of getting an event.
Theoretical probability is the probability that we use normally which describes the percent or probability that an event is likely to happen. This is found using logic.
Experimental probability is the probability that we calculate through the actual experiments that describes the frequency of an event happening. This is found using experiments which are repeated.
They can be same, both of which describes the probability of happening an event.
Hence the experimental probability is found through experiments while theoretical probability are not.
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Branliest to correct answer explain how you solved it please
Answer:
10.4
Step-by-step explanation:
look at the picture for steps
A baseball is thrown in the air from center field to home plate. The path of the baseball is represented by the equation p(x)=−7x2+52x+99. How long will it take for the ball to get to home plate?
Tell me what steps went wrong as I solved this problem. Explain how to fix it.
Problem:
P(x) = -7x2 +52x+99
Step 1: -7x2 +52x+99 = 0
Step 2: a = -7 b = 52 c = 99
Step 3: −52±(52)2−4(−7)(99)√2(−7)
Step 4: −52±5476√14
Step 5:−52±7414
Step 6: x = 117 x = - 9
Answer: 117 seconds
Answer:
steps 3 went wrong
Step-by-step explanation:
the quadratic is
(-b +/- √ ( b^2 - 4ac) )/2a
-52 + √( 2704 +2772) /-14
-52 +74) / -14 = -22/14 = -11/7
-52 -74 / -14 = -126/-14 = 9
Please help!!! Please help me! This is due tomorrow and I really need some help! Thank you.
Answer:
ok i'll help u say thankyu to me!!!oshiee
Can someone help me? Forgot how to do this, it’s been awhile
Answer: y=5
Step-by-step explanation:
Similar basically means it's the same shape but bigger. Condiering how 16-9=7 which means each side is 7 bigger than the original shape. You subtract 7 from 12(side y) to get 5
For the triangles above, what is the measure of
Answer:
72
Step-by-step explanation
48 + k+l =180
48 +90+l =180
138 +l = 180
l=180 - 138
l = 42
now
l+m+n= 180
42 +m+66 =180
108+m= 180
m= 180 -108 m =72
Mark brainlest
Mr. Farris drives 7 1/2 miles directly west of his home to a restaunt.he then drives 8 2/3 miles directly east of the restauant to his office. how far , and in what direction is his office from his home ?
Answer:
2 1/6
Step-by-step explanation:
8 2/3 - 7 1/2 = 2 1/6
9514 1404 393
Answer:
1 1/6 miles east of home
Step-by-step explanation:
If we consider east to be positive, then the distance from home to office is ...
(-7 1/2) +(+8 2/3) = -7 3/6 +8 4/6 = (8 -7) +(4/6 -3/6) = +1 1/6
Farris's office is 1 1/6 miles east of his home.
Please help me this is due in 20 minutes!!!!!!!
Answer:
The two triangles are very similar by them both having the same kind of angles even though they are different in size, like, an acute angle.
I'm not sure if this helped or not hopefully it did good luck.
Jason is laying out a square garden on his property. The space measures 46 feet diagonally. How long is each side of the garden?
Please help I woll do brainly
Answer:
i believe it is y=50x+40
Step-by-step explanation:
There are only seven days left until we launch of our new product and we only have $668 left in our promotion budget we need to spend $85 on the last day can you please calculate how many dollars a day we can spin on the remaining days
Answer:
$97.17
Step-by-step explanation:
First, subtract 85 from 668:
668 - 85
= 583
This means that our budget for all of the days excluding the last day is $583
To find how much can be spent on the remaining days, divide 583 by 6:
583/6
= 97.17
So, approximately $97.17 can be spent on the remaining days
What is the correct factorization of x² - 2x - 15?
a. (x + 5)(x-3)
b. (x - 5) (x + 3)
C. (x + 5)(x + 3)
d. (x - 5)(x-3)
Write the following ratio as a fraction in lowest terms:
4.4 g to 1.2 pounds
Answer:
3 2/3
Step-by-step explanation:
Hope this is right
Answer: 3 2/3
Step-by-step explanation:
Please help I will give points
im almost done with this hw. plz help!!! give explanation if you actually know the answer so ik u dont just want points
Answer:
C
Step-by-step explanation: