Z-scores are useful because
A) z-scores indicate a person's standing as compared to the group mean
B) z-scores can be converted to percentiles (assuming a relatively normal distribution)
C) z-scores are usually positive
D) both a and b

Question

Quizplus · Accepted Answer

Option A is correct because z-scores indicate a person's standing as compared to the group mean by showing how many standard deviations above or below the mean a data point falls. Option B is correct because z-scores can be converted to percentiles assuming a relatively normal distribution. Option C is incorrect because z-scores can be negative, zero, or positive depending on the location of the data point relative to the mean.

Z-Scores Are Useful Because