What is the approximate z-value you would use if you wish to construct a 98% upper confidence bound for the difference between population proportions?
A) 2.33
B) 2.05
C) 1.65
D) 1.41

Question

Quizplus · Accepted Answer

To construct a 98% upper confidence bound, we need to find the z-value such that the area to the right of it under the standard normal distribution is 0.01. Using a standard normal distribution table or calculator, we find that a z-value of 2.05 corresponds to an area of 0.0197. This is the closest value to 0.01, so we would use a z-value of 2.05 for a 98% upper confidence bound.

What Is the Approximate Z-Value You Would Use If You