A therapist has a goal to reduce the mean number of patient symptoms expressed for a particular disorder to two symptoms per day.Following therapy,she determines that the z score for 2 symptoms per day is 0.Assuming the data are normally distributed,did she reach her goal?
A) No, because the z score indicates 0 improvement.
B) No, because the z score is not negative (indicating a reduction in symptoms).
C) Yes; in fact, she actually reduced the mean number of symptoms to 0.
D) Yes, because a z score of 0 is the average, or mean.

Question

Quizplus · Accepted Answer

A z score of 0 represents the mean. Therefore, if the therapist has reduced the mean number of symptoms expressed to 2 per day, and the z score for 2 symptoms per day is 0, then she has successfully reached her goal.

A Therapist Has a Goal to Reduce the Mean Number