a pharmaceutical company has developed a new drug to reduce cholesterol the pharmaceutical company collected data by giving the new drug to a random sample of 50 people from the population of people with high cholesterol. The reduction in the cholesterol level after one month of use was recorded for each individual in the sample. The regulatory agency used a 95% interval estimate of (19.74, 28.26) for the population mean reduction in cholesterol level for the new drug.

A. Find two values for t*, one from table B and one using technology

B. Given that the standard deviation for the sample is 15 mg/dl, calculate the margin of error for the confidence interval. Which t* value was used in constructing the interval?