(b)Zhelong claimed she needs different to 29 minutes on average to repair brokencustomers' computers. A total of 20 computers left by customers were randomlyselected. Through the record from the sample, the average time taken was 28.5 minuteswith a standard deviation of 2.5 minutes. Assume the time is normally distributed.(i)Determine is the population standard deviation given for the above case study?(ii)Test the claim at a 5% significance level using a critical value approach.

Answered: Image /qna-images/answer/bedb7a2d-cf1a-46b2-afe0-d2cc6a2f7243.jpg

Answered: Zhelong claimed she needs different to…

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 nurse in the immunization clinic claims that the mean age at which children start walking is 12.5 months. Dr Allan wanted to check if this claim is true. He took a random sample of 20 children and found that the mean age at which children started walking was 12.9 months with a standard deviation of 0.80 month. Using a 5% level of significance, test the hypothesis that the mean walking age is different from 12.5 months. Based on the result of the test statistic can we conclude that the mean population age at which children start walking is different from the sample mean age
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