Question

1. In preparing to do a study on the proportion of people who use internet gambling sites, you must determine how

many people to survey. If you want to be 99% confident that the population proportion is within 3 percentage

points, how many people must you survey?

2.The National Health and Nutrition Examination Survey reported that in a recent year, the mean serum cholesterol

level for U.S. adults was 202, with a standard deviation of 41 milligrams per deciliter. A simple random sample of

110 adults is choose, find the probability that the mean cholesterol level is greater than 210.

3. In a Gallup poll, 64% of the people polled answered yes to the following question: “Are you in favor of

the death penalty for a person convicted of murder?” The margin of error in the poll was 3% and the

estimate was made with 90% confidence. At least how

many people were surveyed?

Answer 1

3).