A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1400 hours. A homeowner selects 25
bulbs and finds the mean lifetime to be 1390 hours with a standard deviation of 80 hours. Test the
manufacturerʹs claim. Use $\alpha$ = 0.05.

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The Answer of A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1400 hours. A homeowner selects 25
bulbs and finds the mean lifetime to be 1390 hours with a standard deviation of 80 hours. Test the
manufacturerʹs claim. Use $\alpha$ = 0.05.

A Manufacturer Claims That the Mean Lifetime of Its Fluorescent α\alphaα

A Manufacturer Claims That the Mean Lifetime of Its Fluorescent $\alpha$