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    Hypothesis Testing - Battery Life

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    A manufacturer of flashlight batteries took a sample of 13 batteries from a day's production and used them continuously until they failed to work. The life lengths of the batteries, in hours, until they failed were: 342, 426, 317, 545, 264, 451, 1049, 631, 512, 266, 492, 562, and 298.

    At the .05 level of significance, is there evidence to suggest that the mean life length of the batteries produced by this manufacturer is more than 400 hours?

    © BrainMass Inc. brainmass.com June 3, 2020, 11:08 pm ad1c9bdddf

    Solution Preview

    H0: mu<=400
    Ha: mu>400

    Using Excel, we get the following table


    Mean 473.4615385
    Standard Error 58.45605575
    Median 451
    Mode #N/A
    Standard ...

    Solution Summary

    The solution examines hypothesis testing for a battery life.