) A doctor wants to estimate the mean HDL cholesterol of all20-to 29 year old females. how many subjects are needed to estimate the meanHDL cholesterol within 4 points with 99% confidence assuming s=15.1 based onearlier studies? Suppose the doctor would be content with 90% confidence. howdoes the decrease in confidence affect the sample size required?

A 99% confidence level requires how many subjects? round up tothe nearest subject

A 95% confidence level requires how many subjects? round up tothe nearest subject