The following sample data are from a normal population: 15, 13, 17, 20, 18, 16, 11, 10. (a) What is the point estimate of the population mean? H (b) What is the point estimate of the population standard deviation? (Round your answer to three decimal places.) U (c) With 95% condence, what is the margin of error for the estimation of the population mean? (Round your answer to one decimal place.) H (d) What is the 95% confidence interval for the population mean? (Round your answer to one decimal place.) to: H