If you wish to construct a confidence interval estimate for the difference between two population means, an increase in the sample sizes used will result in:
A) a decrease in the critical value z
B) a narrower confidence interval
C) a wider confidence interval
D) a confidence interval that contains zero
E) a confidence interval that does not contain zero

Question

Quizplus · Accepted Answer

As the sample sizes increase, the standard error of the difference in means decreases, resulting in a narrower confidence interval.

If You Wish to Construct a Confidence Interval Estimate for the Difference