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 points with 99% confidence assuming s= 14.5 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? B Click tihe icon to viow a partial table of critical values.

MATLAB: An Introduction with Applications
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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 points with 99% confidence assuming s= 14.5
based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?
A Click the icon to view a partial table of critical values.
A 99% confidence level requires
subjects. (Round up to the nearest subject.)
- X
Partial Critical Value Table
Critical Value, Z/2
Level of Confidence.
(1-a)• 100%
Area in Each Tail,
90%
0.05
1.645
95%
0.025
1.96
99%
0.005
2.575
Print
Done
Enter your answer in the answer box and then click Check Answer.
Transcribed Image Text: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 points with 99% confidence assuming s= 14.5 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? A Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) - X Partial Critical Value Table Critical Value, Z/2 Level of Confidence. (1-a)• 100% Area in Each Tail, 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575 Print Done Enter your answer in the answer box and then click Check Answer.
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