According to the Gallup-Healthways Well-Being Index,33.3% of Americans in January 2017 reported feeling worried daily.What do you need to know in order to be confident that the true population parameter is close to 33.3%?
A)sampling error
B)systematic error
C)unbiased error
D)margin of error

Question

Quizplus · Accepted Answer

In order to be confident that the true population parameter is close to 33.3%, we need to know the margin of error. The margin of error tells us how much the sample estimate may differ from the true population parameter. Therefore, the best choice is D, margin of error. Sampling error, systematic error, and unbiased error are all related to the accuracy of the sample, but they do not directly address the issue of how close the sample estimate is to the true population parameter.