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

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    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.

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    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.