The consultant is given a sample of 225 batteries to test., Ask an Expert

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A manufacturer of solar energy batteries has recently developed an energy efficient battery. He has hired a researcher to test the battery for its expected hours of sustained operation of such batteries to have a population standard deviation of 20 hours and a population mean of 30 hours. The consultant is given a sample of 225 batteries to test.

A. Calculate the standard error of the mean.

B. calculate the 95% confidence interval.

C. calculate the 99% confidence interval.

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