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=13.9 based on earlier studies? Suppose the doctor would be content with 95% confidence.
How does the decrease in confidence affect the sample size required?
Partial Critical Value Table
Level of Confidence,
(1α) times •100% |
Area in Each Tail, α/2 |
Critical Value, zα/2 |
||
---|---|---|---|---|
90% |
0.05 |
1.645 |
||
95% |
0.025 |
1.96 |
||
99% |
0.005 |
2.575 |
A 99% confidence level requires __?__subjects. (Round up to the nearest subject.)
A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How...
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=11.4 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample sizerequired? Level of Confidence, (1−α)•100% Area in Each Tail, α2 Critical Value, zα/2 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575
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 = 11.1 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? 5 Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up...
9.2.41 Question Help 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-11.9 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values A 99% confidence level requires subjects (Round up to...
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