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Statistics / Introduction to Probability and Statistics 1 14 / Chapter 9.4 / Problem 28

Introduction to Probability and Statistics 1 | 14th Edition | ISBN: 9781133103752 | Authors: William Mendenhall Robert J. Beaver, Barbara M. Beaver

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Noise and Stress In Exercise 8.52, you comparedthe effect of stress in the form of noise

Chapter 9, Problem 28

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QUESTION:

Noise and Stress In Exercise 8.52, you comparedthe effect of stress in the form of noise on theability to perform a simple task. Seventy subjects weredivided into two groups; the first group of 30 subjectsacted as a control, while the second group of 40 wasthe experimental group. Although each subject performedthe task, the experimental group subjects hadto perform the task while loud rock music was played. The time to finish the task was recorded for each subjectand the following summary was obtained:Control Experimentaln 30 40x 15 minutes 23 minutess 4 minutes 10 minutesa. Is there sufficient evidence to indicate that the averagetime to complete the task was longer for theexperimental rock music group? Test at the 1%level of significance.b. Construct a 99% one-sided upper bound for the difference(control experimental) in average timesfor the two groups. Does this interval confirm yourconclusions in part a?

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QUESTION:

Noise and Stress In Exercise 8.52, you comparedthe effect of stress in the form of noise on theability to perform a simple task. Seventy subjects weredivided into two groups; the first group of 30 subjectsacted as a control, while the second group of 40 wasthe experimental group. Although each subject performedthe task, the experimental group subjects hadto perform the task while loud rock music was played. The time to finish the task was recorded for each subjectand the following summary was obtained:Control Experimentaln 30 40x 15 minutes 23 minutess 4 minutes 10 minutesa. Is there sufficient evidence to indicate that the averagetime to complete the task was longer for theexperimental rock music group? Test at the 1%level of significance.b. Construct a 99% one-sided upper bound for the difference(control experimental) in average timesfor the two groups. Does this interval confirm yourconclusions in part a?

ANSWER:

Step 1 of 4

(a) Given:

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