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A manufacturer of flashlight batteries took a sample of 15batteries from a day's production and used them continuously until they failed to work.The life lengths

A manufacturer of flashlight batteries took a sample of 15batteries 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.

See attached Excel for Data.

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 500hours?

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