1. Sample data from a normal population are located in the spreadsheet below. Use the data to answer the following questions for the unknown case.

123456789pnpBn5 10 11 A Sample Data 16 7 20 7 19 18 10 2 B C Interval Estimate of a Population Mean: Sigma Unknown Case Sample Size Mean Standard Deviation Confidence Coefficient Level of Significance Margin of Error Point Estimate C.I. Lower Limit C.I. Upper Limit 0.95 a. The point estimate of the population mean is (to 2 decimals) b. The standard deviation is (to 2 decimals) c. The margin of error is (to 1 decimal) d. The 95% confidence interval is (to 1 decimal) to