Question
A doctor wants to estimate the mean HDL cholesterol of all20- to29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within
A doctor wants to estimate the mean HDL cholesterol of all20- to29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3
3 points with 99 %
99% confidence assuming s equals 15.4
s=15.4 based on earlierstudies? Suppose the doctor would be content with 95 %
95% confidence. How does the decrease in confidence affect the sample sizerequired?
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Level ofConfidence, (1minus
alpha
)times
100%
Area in EachTail, StartFraction alpha Over 2 EndFraction
2
CriticalValue, z Subscript alpha divided by 2
Level of confidence area in each trial critical value
90% .05 1.645
95 % .025 1.96
99% .005 2.575
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