A doctor wants to estimate the mean HDL cholesterol of all​ 20-to​ 29-year-old females. How many subjects are needed to estimatethe mean HDL cholesterol within 4 points with 99 % confidenceassuming s equals 13.9 based on earlier​ studies? Suppose thedoctor would be content with 90 % confidence. How does the decreasein confidence affect the sample size​ required? A​ 99% confidencelevel requires nothing subjects. ​(Round up to the nearest​subject.) A 90 % confidence level requires nothing subjects.​(Round up to the nearest​ subject.)
99 % confidence is
90 confidence is
How does the decrease in confidence affect the sample size​required?
A. Decreasing the confidence level increases the sample sizeneeded.
B. Decreasing the confidence level decreases the sample sizeneeded.
C. The sample size is the same for all levels of confidence.
