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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?

https://brainmass.com/statistics/hypothesis-testing/hypothesis-testing-battery-life-265229

#### Solution Preview

H0: mu<=400
Ha: mu>400

Using Excel, we get the following table

------------------------------------------------
Column1

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

#### Solution Summary

The solution examines hypothesis testing for a battery life.

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