It is only when sample size is allowed to vary that it is possible to achieve given levels of both precision and confidence.

Question

Quizplus · Accepted Answer

This statement is true. When sample size varies, it allows us to choose a larger sample size to achieve a higher level of precision and confidence, or a smaller sample size to achieve a lower level. Fixed sample sizes may not allow for both precision and confidence to be met simultaneously.

It Is Only When Sample Size Is Allowed to Vary