# Question

Dr. Paul Oswiecmiski wants to estimate the mean serum HDL cholesterol of all 20- to 29-year-old males. How many subjects are needed to estimate the mean serum HDL cholesterol of all 20-to 29-year-old males within 1.5 points with 90% conﬁdence, assuming that s = 12.5 based on earlier studies?

Suppose that Dr. Oswiecmiski would prefer 95% conﬁdence. How does the increase in conﬁdence affect the sample size required?

Suppose that Dr. Oswiecmiski would prefer 95% conﬁdence. How does the increase in conﬁdence affect the sample size required?

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