Homework:Module 6 - Section 9.2

Question 8, 9.2.39

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Part 1

A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within

4

points with

99%

confidence assuming

s=19.7

based on earlier studies? Suppose the doctor would be content with

90%

confidence. How does the decrease in confidence affect the sample size required?

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Part 1

A 99% confidence level requires

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subjects. (Round u