MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Concept explainers

2-Proportion Test
In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.
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A washing machine manufacturer advertises that the median life of the machines is at least 8 years.   A consumer advocacy group located 20 of these machines and found that 12 of them actually lasted less than 8 years, with none of them lasting exactly 8 years.   At α =0.05, test the claim that the median life is less than 8 hours.

A.   What is the test statistic?

 

B.  What is the critical value?

 

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