for 99% CI:
for99% CI crtiical Z = | 2.576 | |
standard deviation σ= | 12.4 | |
margin of error E = | 3 | |
required sample size n=(zσ/E)2 = | 114 |
for 90% CI:
for90% CI crtiical Z = | 1.645 | |
standard deviation σ= | 12.4 | |
margin of error E = | 3 | |
required sample size n=(zσ/E)2 = | 47 |
decreasing confidence interval required smaller sample size
A doctor wants to estimate the mean HDL cholesterol of all 20-to 29-year-old females. How many...
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 2 points with 99% confidence assuming s 16.5 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. subjects. (Round up to the nearest subject.) A 99% confidence...
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 equals 10.1 based on earlier studies? Suppose the doctor would be content with 95 % confidence. How does the decrease in confidence affect the sample size required? LOADING... Click the icon to view a partial table of critical values. A 99% confidence level requires nothing...
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 19.5 based on earlier studies? Suppose the doctor would be content with 90 % confidence How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requiressubjects. (Round up to...
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...
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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 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 the nearest subject) A 90% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? O A. Decreasing the confidence level decreases the sample...
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 33 points with 99%confidence assuming s=13.2 based on earlier studies? Suppose the doctor would be content with 95 % confidence. How does the decrease in confidence affect the sample size required? A 99% confidence level requires_____ subjects? (Round up to the nearest subject) A 95% confidence level requires _____subjects? (Round up to the...
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%...
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 estimati the mean HDL cholesterol within 3 points with 99% confidence assuming s = 13.3 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 131 subjects....
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...