The Difference Between Z Scores and Standard Scores Is That

Multiple Choice

The difference between z scores and standard scores is that

A) z scores can never be negative, whereas standard deviation scores always are
B) z scores can only be calculated with reference to the mean, whereas standard scores relate to the median
C) z scores can only be calculated with reference to the standard deviation, whereas standard scores relate to the variance
D) none of these, since z scores are standard scores