question archive A doctor wants to estimate the mean HDL cholesterol of all? 20- to? 29-year-old females
A doctor wants to estimate the mean HDL cholesterol of all? 20- to? 29-year-old females
Subject:MathPrice: Bought3
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 3
3 points with 99 %
99% confidence assuming s equals 15.4
s=15.4 based on earlier? studies? Suppose the doctor would be content with 95 %
95% confidence. How does the decrease in confidence affect the sample size? required?
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Click the icon to view a partial table of critical values.
Level of? Confidence, ?(1minus
−alpha
α?)times
•?100%
Area in Each? Tail, StartFraction alpha Over 2 EndFraction
α2
Critical? Value, 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
