Assume that the breaking strengths for all steel rods of a certain type constitute a normal population. A sample of 12 measurements selected from this population gave a sample mean of 3.56 tons and sample standard deviation of 0.38 tons. a. Find 99% confidence interval for the population mean. Keep two digits after decimal point in the answer. 99% confidence interval for the population mean is ( b. Find 99% confidence interval for the population standard deviation. Keep two digits after decimal point in the answer. 99% confidence interval for the population standard deviation is )

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