Assume that a sample is used to estimate a population mean μ. Find the 80% confidence interval for a sample of size 55 with a mean of 75.2 and a standard deviation of 17.7. Enter your answer as an open-interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). 80% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

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