Suppose you wish to estimate the difference between two population means when the population variances are known. Which critical values of z can you use to develop the 90% confidence interval estimate?
A) 2.33
B) 1.96
C) 1.645
D) 1.28

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.

Suppose You Wish to Estimate the Difference Between Two Population