Demi converted scores from a customer service questionnaire to z scores, and some of them are negative.She is trying to use a z table but is confused because there are no negative z scores in the tables.What should she do?
A) Use the positive value because the normal curve is symmetric.
B) Square the negative z-score value so that it becomes positive.
C) Add 1.0 to the negative z-score value so that it becomes positive.
D) Use 0 as the value for the z score.

Question

Quizplus · Accepted Answer

The normal curve is symmetric, so the positive and negative z scores have the same area under the curve. Therefore, we can use the positive value from the table without any issues.

Demi Converted Scores from a Customer Service Questionnaire to Z