If the Population Variances Are Assumed to Be Known in an Application

Multiple Choice

If the population variances are assumed to be known in an application where a manager wishes to estimate the difference between two population means,the 95 percent confidence interval estimate can be developed using which of the following critical values?

A) z = 1.645
B) z = 1.96
C) t value that depends on the sample sizes from the two populations
D) z = 2.575