(Answered) Eye doctor wants to estimate the hdl cholesterol of all 20

Statistics

Eye doctor wants to estimate the HDL cholesterol of all 20 to 29 year old females.

A. How many subjects are needed to estimate the HDL cholesterol within four points with 99% confidence assuming the average of 18.2

B. Suppose the doctor would be content with 90% confidence.

C. How does this decrease the confidence affect the sample size required

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