Answered: Question 21 A quality-assurance…

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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Question 21

A quality-assurance inspector periodically examines the output of a machine to determine whether it is properly adjusted. When set properly, the machine produces nails having a mean length of 2.000 inches, with a standard deviation of 0.070 inches. For a sample of 35 nails, the mean length is 2.025 inches.

If the null and alternative hypotheses can be used to conclude that the machine is adjusted properly, at 15% level of significance, do you reject or fail reject H0?

		Reject H0 because Z-statistic is greater than z-critical
		Reject H0 because Z-critical is more than 1.435
		Reject H0 because Z-critical is less than -1.435
		Reject H0 because Z-critical lies between 1.435 and -1.435

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