The following ranges are possible 95% confidence intervals for the percentage of Americans who think they work too many hours. For which one of the confidence intervals could you conclude that a majority of the population thinks they work too many hours?
A) 41% to 49%
B) 49% to 54%
C) 42% to 51%
D) 52% to 58%

Question

Quizplus · Accepted Answer

For a majority of the population to think they work too many hours, the confidence interval must be entirely above 50%. Option D, with a range from 52% to 58%, is the only interval entirely above 50%, indicating a majority.

The Following Ranges Are Possible 95% Confidence Intervals for the Percentage