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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.

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. These data are also available in the worksheet Batteries in the Excel workbook data.xls.

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?

A. No, because the p-value for this test is equal to .1164
B. Yes, because the test value 1.257 is less than the critical value 1.782
C. No, because the test value 1.257 is greater than the critical value 1.115
D. Yes, because the test value 1.257 is less than the critical value 2.179

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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,...

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