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Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence...

Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence interval for a sample of size 68 with a mean of 49.2 and a standard deviation of 9.8. 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.

Math   Statistics-And-Probability   
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