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A company that claims the average time a customer waits on hold is less than 5 minutes. A sample of 35 customers has an average wait time of 4.78 minutes. Assume the population standard deviation for wait time is 1.8 minutes. (i) Test the company’s claim at the α = 0:05 significance level by comparing the calculated z-score to the critical z-score. (ii) Verify your answer to Problem (i) by comparing the sample mean ¯ x = 4:78 to the critical sample mean ¯ xc. (iii) Verify your answer to Problem (i) by comparing the p-value to the level of significance α = 0:05.

A company that claims the average time a customer waits on hold is less than 5 minutes. A sample of 35 customers has an average wait time of 4.78 minutes. Assume the population standard deviation for wait time is 1.8 minutes. (i) Test the company’s claim at the α = 0:05 significance level by comparing the calculated z-score to the critical z-score. (ii) Verify your answer to Problem (i) by comparing the sample mean ¯ x = 4:78 to the critical sample mean ¯ xc. (iii) Verify your answer to Problem (i) by comparing the p-value to the level of significance α = 0:05.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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 A company that claims the average time a customer waits on hold is less than 5 minutes. A sample of 35 customers has an average wait time of 4.78 minutes. Assume the
population standard deviation for wait time is 1.8 minutes.
(i) Test the company’s claim at the α = 0:05 significance level by comparing the calculated z-score to the critical z-score.
(ii) Verify your answer to Problem (i) by comparing the sample mean ¯ x = 4:78 to the critical sample mean ¯ xc.
(iii) Verify your answer to Problem (i) by comparing the p-value to the level of significance α = 0:05. 

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