Salt-free diets are often prescribed to the people with high blood pressure. The following data values were obtained from experiment designed to determine the reduction in diastolic blood pressure as a result of consuming a salt-free diet for 2 weeks. Assume diastolic readings are normally distributed.
Before 93 106 87 92 102 95 88 110
After 92 102 89 92 101 96 88 105
a. What is the point estimate for the mean reduction in the diastolic reading after 2 weeks on this diet?
b. Find the 99% confidence interval for the mean reduction.