A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner selects 25 ofthese batteries and finds the mean lifetime to be 1380 hours with a standard deviation of 80 hours. Test themanufacturerʹs claim. Use α = 0.05. Round the test statistic to the nearest thousandth.

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The Answer of A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner selects 25 ofthese batteries and finds the mean lifetime to be 1380 hours with a standard deviation of 80 hours. Test themanufacturerʹs claim. Use α = 0.05. Round the test statistic to the nearest thousandth.

A Manufacturer Claims That the Mean Lifetime of Its Lithium