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A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How...

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Basic Math

A doctor wants to estimate the mean HDL cholesterol of all​ 20-to​ 29-year-old females. How many subjects are needed to estimatethe mean HDL cholesterol within 4 points with 99 % confidenceassuming s equals 13.9 based on earlier​ studies? Suppose thedoctor would be content with 90 % confidence. How does the decreasein confidence affect the sample size​ required? A​ 99% confidencelevel requires nothing subjects. ​(Round up to the nearest​subject.) A 90 % confidence level requires nothing subjects.​(Round up to the nearest​ subject.)

99 % confidence is

90 confidence is

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

A. Decreasing the confidence level increases the sample sizeneeded.

B. Decreasing the confidence level decreases the sample sizeneeded.

C. The sample size is the same for all levels of confidence.

Answer & Explanation Solved by verified expert
3.8 Ratings (720 Votes)
Solution Given thatstandard deviation s 139Margin of error E 4At 99 confidence level the z is 1 99 1    See Answer
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