An example of a confidence interval is ________.
A)A Wall Street Journal poll reports that 45% - 48% of farmers produce grains
B)A New York Times survey states that more than 65% of American families own their own homes
C)A Gallup poll reports that 56% ± 3% of voters support candidate A
D)An editorial in Smart Money magazine states that the President is confident he will be re-elected

Question

Quizplus · Accepted Answer

A confidence interval is a range of values that is likely to contain the true population parameter with a certain degree of confidence. Option C states that the Gallup poll reports 56% ± 3% of voters support candidate A, which means that the true proportion of voters supporting candidate A is likely to be between 53% and 59% with 95% confidence. Options A, B, and D do not provide a range of values or a confidence level.

An Example of a Confidence Interval Is ________