Increasing the sample size when calculating a confidence interval while keeping the confidence level constant will
A)increase the margin of error resulting in a narrower (more precise)confidence interval.
B)reduce the margin of error resulting in a narrower (more precise)confidence interval.
C)reduce the margin of error resulting in a wider (less precise)confidence interval.
D)increase the margin of error resulting in a wider (more precise)confidence interval.

Question

Quizplus · Accepted Answer

Increasing the sample size decreases the margin of error, which results in a narrower (more precise) confidence interval, because the standard error of the mean decreases as sample size increases.

Increasing the Sample Size When Calculating a Confidence Interval While