A confidence interval increases in width as
A) the level of confidence increases.
B) n decreases.
C) s increases.
D) All of the other choices are correct.

Question

Quizplus · Accepted Answer

A confidence interval is a range of values that is likely to contain the true population parameter with a certain level of confidence. The width of the interval is determined by several factors, including the level of confidence, sample size (n), and sample standard deviation (s). As the level of confidence increases, the range of values that could contain the true parameter widens, resulting in a wider confidence interval. A smaller sample size (n) leads to greater uncertainty and wider intervals. A higher standard deviation (s) indicates more variability in the sample, and therefore a wider interval. Therefore, all of the other choices are correct.

A Confidence Interval Increases in Width as