Question

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=19.2 based on earlier studies? suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

1. A 99% confidence level requires __ subjects (round up to the nearest subject)

2. A 95% confidence level requires __ subjects (round up to the nearest subject)

3. How does the decrease in confidence affect the sample size required?

A. Decreasing the confidence level decreases the sample size needed

B. The sample size is the same for all levels of confidence

C. Deceasing the confidence level increases sample size needed

Answer 1

https://drive.google.com/open?id=1miDykB956rSHGgAYD93YaJKxmD9a_oZ1

https://drive.google.com/open?id=1miDykB956rSHGgAYD93YaJKxmD9a_oZ1