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 = 13.8 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size? 99% requires ??? subjects 95% requires subjects How does the decrease in confidence affect the sample size

Identify the statement below as either descriptive or inferential statistics. upper a certain website sold an average of 117 books per day last week. is the statement an example of descriptive or inferential statistics? a. it is an example of descriptive statistics because it uses a sample to make a claim about a population. b. it is an example of inferential statistics because it uses a sample to make a claim about a population. c. it is an example of inferential statistics because it summarizes the information in a sample. d. it is an example of descriptive statistics because it summarizes the information in a sample.