A company which produces batteries claims that the life expectancy of their batteries is 90 hours. In order to test the claim, a consumer interest group tested a random sample of 40 batteries. The test resulted to a mean life expectancy of 87 hours. Using a 0.05 level of significance, can it be concluded that the life expectancy of their batteries is less than 90 hours? Assume that the population standard deviation is known to be 10 hours.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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a. State the null and the alternative hypotheses

b. compute the test statistic

c. determine the critical value and the rejection region

d. draw a conclusion

A
which produces batteries claims that the life
expectancy of their batteries is 90 hours. In order to test the
claim, a consumer interest group tested a random sample of
40 batteries. The test resulted to a mean life expectancy
company
of
87 hours. Using a 0.05 level of significance, can it be concluded
that the life expectancy of their batteries is less than 90 hours?
Assume that the population standard deviation is known to be
10 hours.
cs
Transcribed Image Text:A which produces batteries claims that the life expectancy of their batteries is 90 hours. In order to test the claim, a consumer interest group tested a random sample of 40 batteries. The test resulted to a mean life expectancy company of 87 hours. Using a 0.05 level of significance, can it be concluded that the life expectancy of their batteries is less than 90 hours? Assume that the population standard deviation is known to be 10 hours. cs
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