Salt-free diets are frequently prescribed to people with the 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 salt-free diet for 2 weeks. Suppose diastolic readings to be normally distributed.
Before 106 97 93 94 94 97 88 94
After 101 87 89 91 85 96 82 84
(a) Determine the point estimate for the mean reduction in the diastolic reading after 2 weeks on this diet? (Give your answer correct to one decimal place.)
(b) Find the 99% confidence interval for the mean reduction. (Give your answers correct to two decimal places.)
Lower Limit
Upper Limit