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A manufacturer claims that the...

A manufacturer claims that the mean lifetime of its lithium batteries is less than 900 hours. A

homeowner selects 20 of these batteries and finds the mean lifetime to be 855 hours with a

standard deviation of 95 hours. Test the manufacturer's claim. Use α = 0.05.

homeowner selects 20 of these batteries and finds the mean lifetime to be 855 hours with a

standard deviation of 95 hours. Test the manufacturer's claim. Use α = 0.05.

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