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You intend to estimate a population mean μ μ with the following sample. 64.6 64.8 63.4...

You intend to estimate a population mean μ μ with the following sample. 64.6 64.8 63.4 58.5 65.9 64 50.7 65.4 69.3 72.7 66.3 You believe the population is normally distributed. Find the 80% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to twp decimal places (because the sample data 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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