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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. find out the standard error of the mean. B. find out the 95% confidence interval. C. find out the 99% confidence interval.

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