The following sample data are from a normal population: 10, 9, 12, 14, 13, 11, 6, 5. a. What is the point estimate of the population mean? b. What is the point estimate of the population standard deviation (to 3 decimals)? c. With 95% confidence, what is the margin of error for the estimation or the population mean (to 1 decimal)? d. What is the 95% confidence interval for the population mean (to 1 decimal