In developing a confidence interval estimate for the difference between two population means, which of the following will result from an increase in the size of the sample?
A) a wider confidence interval
B) a narrower confidence interval
C) a smaller critical z-value
D) a larger critical z-value

Question

Quizplus · Accepted Answer

Increasing the sample size increases the precision of the estimate and reduces the standard error, resulting in a narrower confidence interval. A larger sample size does not have an effect on the critical z-value.

In Developing a Confidence Interval Estimate for the Difference Between