In developing a confidence interval estimate for the difference between two population means, an increase in the size of the samples will result in:
A) a wider confidence interval
B) a narrower confidence interval
C) a smaller critical value z
D) the same confidence interval
E) none of these

Question

Quizplus · Accepted Answer

Increasing the sample size decreases the standard error, which leads to a narrower confidence interval.

In Developing a Confidence Interval Estimate for the Difference Between