Question: 9 Salt-free diets are often prescribed to people with high blood pressure. The following data values were obtained from an experiment designed to estimate the reduction in diastolic blood pressure as a result of consuming a salt-free diet for 2 weeks. Assume diastolic readings to be normally distributed.

a. What is the point estimate for the mean reduction in the diastolic reading after 2 weeks on this diet?

b. Find the 98% confidence interval for the mean reduction.