A Researcher Wants to Estimate the Mean Cholesterol Level of People

Multiple Choice

A researcher wants to estimate the mean cholesterol level of people in his city.A random sample of 21 people yields an average cholesterol level of 219,with a margin of error of ±12.Assume the researcher used a confidence level of 90%.

A) 90% of the people sampled have cholesterol levels between 207 and 231.
B) We are 90% confident that 90% of people in the city have a cholesterol level between 207 and 231.
C) The researcher can be 90% confident that the mean cholesterol level for people in his city is between 207 and 231.
D) About 9 out of 10 people in the researcher's city have cholesterol levels between 207 and 231.
E) If we took many random samples of people in the city,about 9 out of 10 of them could produce a confidence interval of (207,231) .