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    Z test for population mean

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    1. A battery was designed to last an average of 30 hours in a radio. Complaints are pouring in that the batteries are junk and do not perform as expected. You test 24 batteries and find :
    X = 29.3
    S = 2.95
    Normality assumed
    Is there sufficient evidence to indicate premature battery failure at the  = .05 level?

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    Solution Preview

    Hypothesis Testing (Z- Testing)
    1. A battery was designed to last an average of 30 hours in a radio. Complaints are pouring in that the batteries are junk and do not perform as expected. You test 24 batteries and find :
    X = 29.3
    S = 2.95
    Normality assumed
    = .05 ...

    Solution Summary

    The solution provides step by step method for the calculation of Z test statistic and P value . Formula for the calculation and Interpretations of the results are also included.

    $2.19

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