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Tes the claim that the lifetime of the batteries is at least 30 months.

The manufacturer of batteries for aircraft emergency vehicles claims that lifetime of the 1500 batteries that have been manufactured is normally distributed with a mean of at least 30 months and a standard deviation of 3 months. An aircraft manufacturer checks out 25 batteries that they purchased and discovers a sample mean of 29 months.

Please use the attachments provided and not only excel functions.

[See the attached Question File.]

Solution Preview

n = 25, x-bar = 29, sigma = 3, mu = 30; Let alpha = 0.05

t = (x-bar - ...

Solution Summary

This solution uses the t statistic to test the hypothesis and show the p value is greater that 0.5.