If you wish to construct 98% upper confidence bound (UCB) for the difference between population proportions, then the approximate z-value you should use is:
A) 2.33
B) 2.05
C) 1.96
D) 1.65
E) 1.41

Question

Quizplus · Accepted Answer

For a 98% confidence level, the z-value closest to the upper tail of the standard normal distribution is approximately 2.05. This value is used to calculate the margin of error for the confidence interval.

If You Wish to Construct 98% Upper Confidence Bound (UCB)