A sample of 8 senior citizens indicate the following prescription cost in dollar for Zocor (a drug used to lower the cholesterol):
98 104 126 110 112 115 100 99
a. What is the point estimate for the population mean and standard deviation of the prescription cost of Zocor?
b. Assuming that the distribution of Zocor prescription cost is normally distributed, find the 95% confidence interval estimate for the population mean prescription cost of Zocor?