a doctor wanted to estimate

A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 1 points with $9% confidence assuring s = 16.3 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. . .. A 99% confidence level requires subjects. (Round up to the nearest subject.) A 95% confidence level requires |subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? A. Decreasing the confidence level increases the sample size needed. O B. The sample size is the same for all levels of confidence. O C. Decreasing the confidence level decreases the sample size needed