All else being equal, increasing the level of confidence desired will
A) tighten the confidence interval.
B) decrease the margin of error.
C) increase precision.
D) increase the margin of error.
E) Both A and D.

Question

Quizplus · Accepted Answer

Increasing the level of confidence desired will increase the margin of error because a higher level of confidence requires a wider interval to account for more possible outcomes. Therefore, option D is the best choice. Option A is incorrect because increasing the level of confidence will widen, not tighten, the interval. Option B is incorrect because increasing the level of confidence will increase, not decrease, the margin of error. Option C is incorrect because increasing the level of confidence does not necessarily increase precision.

All Else Being Equal, Increasing the Level of Confidence Desired