Assume that a sample is used to estimate a population mean . Find the 90% confidence interval for a sample of size 69 with a mean of 82.5 and a standard deviation of 21.4. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places. 90% C.I. (78.203,86.797) X The answer should be obtained without any preliminary rounding.

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