The report of a sample survey of 1014 adults says, “with 95% confidence, between
ID: 3245832 • Letter: T
Question
The report of a sample survey of 1014 adults says, “with 95% confidence, between 9% and 15% of all Americans expect to spend more on gifts this year than last year.”
What does the phrase “95% confidence” mean?
a) 9% to 15% of all Americans will spend 95% of what they spent last year
b) There is a 95% chance that the percent who expect to spend more is between 9% and 15%.
c) The method used to get the interval 9% to 15%, when used over and over again, produces intervals which include the true population proportion 95% of the time.
d) 95% of all Americans will spend between 9% and 15% more than what they spent last year.
Explanation / Answer
“95% confidence” means that the method used to get the interval 9% to 15%, when used over and over again, produces intervals which include the true population proportion 95% of the time.
Option C is correct.