Nine batteries are randomly chosen from a factory and the mass are 7.51, 7.47, 7.53, 7.54, 7.49, 7.48, 7.49, 7.51 and 7.53 kg, respectively. Find a 99% confidence interval for the mean mass of batteries from this factory. (Assume an approximation of normal distribution for the mass of the batteries.)

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Q: Construct a 90% Confidence Interval for the population mean u

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