For a 99% confidence interval, you use the Z scores for the middle 99% of the normal curve, which comes out to:
A)+1.64 and -1.64
B)+2.58 and -2.58
C)+3.04 and -3.04
D)+1.58 and -1.58

Question

Quizplus · Accepted Answer

The Z scores for the middle 99% of the normal curve are +2.58 and -2.58. This is a common rule for confidence intervals and can be found on a standard normal distribution table.

For a 99% Confidence Interval, You Use the Z Scores