A 99% confidence level requires subjects. (Round up to the nearest subject.) A 90% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? O A. Decreasing the confidence level decreases the sample size needed. O B. Decreasing the confidence level increases the sample size needed. O C. The sample size is the same for all levels of confidence.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 2 points with 99% confidence assuming s = 18.9 based on earlier studies? Suppose the doctor would be content with 90% 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 593 subjects. (Round up to the nearest subject.) - X Partial critical value table A 90% confidence level requires subjects. (Round up to the nearest subject.) Level of Confidence, Critical Value, Zx/2 (1- a) . 100% Area in Each Tail, 30% 0.05 1.645 95% 0.025 1.96 39% 0.005 2.575 Print DoneA 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 2 points with 99% confidence assuming s = 18.9 based on earlier studies? Suppose the doctor would be content with 90% 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 593 subjects. (Round up to the nearest subject.) A 90% confidence level requires subjects. (Round up to the nearest subject.)