The true population mean is expected to fall outside a .99 confidence interval
A) 1% of the time
B) 99% of the time
C) 100% of the time
D) none of these, since the true mean may never fall outside the confidence interval

Question

Quizplus · Accepted Answer

A 99% confidence interval means that there is a 1% chance that the true population mean falls outside of the interval. Therefore, choice A is correct. Choice B is incorrect because it suggests that the true mean falls within the confidence interval 99% of the time, which is not true. Choice C is incorrect because there is always some chance that the true population mean falls outside of the confidence interval, no matter how confident we are. Choice D is incorrect because although it is possible for the true mean to never fall outside the confidence interval, it is not always the case.

The True Population Mean Is Expected to Fall Outside a .99