oblem List Next Problem s of a new bug repellent is tested on 13 subjec tes, the average percentage of exposed skin p %. Assume that the population is normally dis otection of more than 90%, Using a = 0.01, c
oblem List Next Problem s of a new bug repellent is tested on 13 subjec tes, the average percentage of exposed skin p %. Assume that the population is normally dis otection of more than 90%, Using a = 0.01, c
Cornerstones of Cost Management (Cornerstones Series)
4th Edition
ISBN:9781305970663
Author:Don R. Hansen, Maryanne M. Mowen
Publisher:Don R. Hansen, Maryanne M. Mowen
Chapter3: Cost Behavior
Section: Chapter Questions
Problem 18E
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Question
1.
![WeBWork 5-2: Problem 12
Previous Problem Problem List Next Problem
(1 point) The effectiveness of a new bug repellent is tested on 13 subjects for a 10 hour period. Based on the number
and location of the bug bites, the average percentage of exposed skin protected from bites was calculated as 94% with
a standard deviation of 11%. Assume that the population is normally distributed and consider the new repellent effective
if it provides a percent protection of more than 90%. Using a = 0.01, conduct an hypothesis test with null hypothesis
u<0.9 and alternative hypothesis u > 0.9 to determine whether the mean protection of the new bug repellent is
greater than 90% by computing the following.
a) The number of degrees of freedom is: df
b) The critical value is: t,
c) The test statistic is: tust
d) The final conclusion is:
O A. we reject the null hypothesis that j =0.9. Our results indicate that the new bug repellent is effective.
CO B. we fail to reject the null hypothesis that a = 0.9. Our results do not provide enough evidence that the new bug
repellent is effective.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8dea674a-70a1-43b9-8845-e26c3ce8e61d%2Fe1836999-4e1f-44b4-ae44-e1b4145f659d%2F5q5qiy_processed.jpeg&w=3840&q=75)
Transcribed Image Text:WeBWork 5-2: Problem 12
Previous Problem Problem List Next Problem
(1 point) The effectiveness of a new bug repellent is tested on 13 subjects for a 10 hour period. Based on the number
and location of the bug bites, the average percentage of exposed skin protected from bites was calculated as 94% with
a standard deviation of 11%. Assume that the population is normally distributed and consider the new repellent effective
if it provides a percent protection of more than 90%. Using a = 0.01, conduct an hypothesis test with null hypothesis
u<0.9 and alternative hypothesis u > 0.9 to determine whether the mean protection of the new bug repellent is
greater than 90% by computing the following.
a) The number of degrees of freedom is: df
b) The critical value is: t,
c) The test statistic is: tust
d) The final conclusion is:
O A. we reject the null hypothesis that j =0.9. Our results indicate that the new bug repellent is effective.
CO B. we fail to reject the null hypothesis that a = 0.9. Our results do not provide enough evidence that the new bug
repellent is effective.
![WeBWork 5-2: Problem 13
Previous Problem Problem List
Next Problem
(1 point) Test the claim that for the population of statistics final exams, the mean score is u = 79 using the alternative
hypothesis that u # 79. Sample statistics include n = 28, z = 81, and s = 12. Use a significance level of
a = 0.05 and assume a normally distributed population.
a) The test statistic is:
b) The positive critical value is:
c) The conclusion is:
O A. there is sufficient evidence to reject the claim that the mean score is equal to 79.
B. there is not sufficient evidence to reject the claim that the mean score is equal to 79.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8dea674a-70a1-43b9-8845-e26c3ce8e61d%2Fe1836999-4e1f-44b4-ae44-e1b4145f659d%2F7ogtp0d_processed.jpeg&w=3840&q=75)
Transcribed Image Text:WeBWork 5-2: Problem 13
Previous Problem Problem List
Next Problem
(1 point) Test the claim that for the population of statistics final exams, the mean score is u = 79 using the alternative
hypothesis that u # 79. Sample statistics include n = 28, z = 81, and s = 12. Use a significance level of
a = 0.05 and assume a normally distributed population.
a) The test statistic is:
b) The positive critical value is:
c) The conclusion is:
O A. there is sufficient evidence to reject the claim that the mean score is equal to 79.
B. there is not sufficient evidence to reject the claim that the mean score is equal to 79.
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