A doctor want to estimate the HDL cholesterol of all 20-to 29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99%confidence assuming Q= 15.4 ? suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? A
A. 99% confidence level requires ____subjects (round to the nearest whole number
B.95% confidence level requires ____ subjects.
How does the decrease in confidence affect the sample size required ?
1.The lower the confidence level the smaller the sample size
2. The sample size is the same for all levels of confidence
3.The lower the confidence level the larger the sample size