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.
Ans: D
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