1. In preparing to do a study on the proportion of people whouse internet gambling sites, you must determine how
many people to survey. If you want to be 99% confident that thepopulation proportion is within 3 percentage
points, how many people must you survey?
2.The National Health and Nutrition Examination Survey reportedthat in a recent year, the mean serum cholesterol
level for U.S. adults was 202, with a standard deviation of 41milligrams per deciliter. A simple random sample of
110 adults is choose, find the probability that the meancholesterol level is greater than 210.
3. In a Gallup poll, 64% of the people polled answered yes tothe following question: “Are you in favor of
the death penalty for a person convicted of murder?†The marginof error in the poll was 3% and the
estimate was made with 90% confidence. At least how
many people were surveyed?
