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

Confidence Interval

A range of values, derived from a sample, that is expected, with a particular probability, to contain the actual value of an unknown population parameter.

Sample Size

The total number of observations or data points collected in a statistical study.

Critical Value

A threshold in hypothesis testing that determines the boundary for rejecting the null hypothesis.