a doctor wants to estimate the mean hdl cholesterol of all 20-29 year old female

Question

a doctor wants to estimate the mean hdl cholesterol of all 20-29 year old females. how many subjects are needed to estimate the mean hdl cholesterol within 3 points with 99% confidence assuming s=11.9 based on earlier studies? suppose the doctor would be content with 90% confidence. how does the decrease in confidence affect the sample size requir a doctor wants to estimate the mean hdl cholesterol of all 20-29 year old females. how many subjects are needed to estimate the mean hdl cholesterol within 3 points with 99% confidence assuming s=11.9 based on earlier studies? suppose the doctor would be content with 90% confidence. how does the decrease in confidence affect the sample size requir a doctor wants to estimate the mean hdl cholesterol of all 20-29 year old females. how many subjects are needed to estimate the mean hdl cholesterol within 3 points with 99% confidence assuming s=11.9 based on earlier studies? suppose the doctor would be content with 90% confidence. how does the decrease in confidence affect the sample size requir

Explanation / Answer

here margin of error E=3

for 99% ; z score =2.5758

std deviation =11.9

here sample size n=(z*std deviation/E)2 =~105.

for 90% CI ; z score =1.645

here sample size n=(z*std deviation/E)2 =~43

therefore for 90% confidence interval requirement of sample size reduces.

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