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A doctor wants to estimate the HDL cholesterol of all20- to29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming =11.9? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample sizerequired?

A99% confidence level requires

subjects.

(Round up to the nearest whole number asneeded.)

A 95% confidence level requires

subjects.

(Round up to the nearest whole number asneeded.)

How does the decrease in confidence affect the sample sizerequired?

A.

The lower the confidence level the smaller the sample size.

B.

The lower the confidence level the larger the sample size.

C.

The sample size is the same for all levels of confidence