Suppose a 95% confidence interval for μ turns out to be (1,000, 2,100). To make more useful inferences from the data, it is desired to reduce the width of the confidence interval. Which of the
Following will result in a reduced interval width?
A) Increase the sample size.
B) Increase the confidence level.
C) Increase the population mean.
D) Increase the sample mean.

Question

Quizplus · Accepted Answer

Increasing the sample size reduces the standard error, which in turn narrows the confidence interval width.

Suppose a 95% Confidence Interval for μ Turns Out to Be