A doctor wants to estimate the HDL cholesterol of all 20- to29-year-old females. How many subjects are needed to estimate theHDL cholesterol within 4 points with 99 % confidence assuming sigmaequals 19.2 question mark Suppose the doctor would be content with95 % confidence. How does the decrease in confidence affect thesample size required? A 99% confidence level requires 153subjects. (Round up to the nearest whole number as needed.) A 95% confidence level requires nothing subjects. (Round up to thenearest whole number as needed.) How does the decrease inconfidence affect the sample size required?
The lower the confidence level the larger the sample size
The sample size is the same for all levels of confidence.
The lower the confidence level the smaller the sample size