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Given: A company produces resistors by the thousands, and Gerry is in charge of qualitycontrol. He picks 20 resistors at random as a sample, and calculates the sample meanx=8.240 kn and sample standard deviation S = 0.314 kQ.To do: (a) Estimate the population mean and the confidence interval of the population mean (asat value) to standard 95% confidence level. (b) Repeat for 99% confidence level. Do you expect the confidence interval to be wider or narrower?

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