If you wish to estimate the difference between two population means when the population variances are known, the 90% confidence interval estimate can be developed using which of the following critical values of z?
A) 2.33
B) 1.28
C) 1.96
D) 2.58
E) 1.645

Question

Quizplus · Accepted Answer

For a 90% confidence interval, the critical z-value is 1.645, which corresponds to the middle 90% of the standard normal distribution.

If You Wish to Estimate the Difference Between Two Population