4. A sample of 100 fluorescent light tubes from the Short Life Tube Company has amean life of 20.5 hours and a standard deviation of 1.6 hours. Test:(a) At the 1% level whether the sample comes from a population with mean 23.2hours.(b) At the 5% level whether it comes from a population with mean 20.8 hours.(c) At the 5% level whether it comes from a population with mean less than 20.8hours

To test these hypotheses, we can use the z-test since we know the population standard deviation and…

Answered: (a) At the 1% level whether the sample…

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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At a local food processing plant, it used to take an average of 90 minutes for new workers to learn a food processing job. Recently the company installed a new food processing machine. The supervisor at the company wants to find if the mean time taken by new workers to learn the food processing procedure on this new machine is different from 90 minutes. A sample of 20 workers showed that it took, on average, 85 minutes for them to learn the food processing procedure on the new machine. It is known that the learning times for all new workers are normally distributed with a population standard deviation of 7 minutes. Use a significance level of 0.01 to test the claim that the mean time is different from 90 minutes. What is the test statistic? A) -7.01 B) -2.539 C) -3.19 D) -2.528 E) -1.96

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(a) At the 1% level whether the sample comes from a population with mean 23.2 hours. (b) At the 5% level whether it comes from a population with mean 20.8 hours. (c) At the 5% level whether it comes from a population with mean less than 20.8 hours