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
Question 2
The percentage values on the z score table are only valid when
a. the z scores are positive
b. the raw score mean equals 50
c. the raw score mean is greater than 50
d. the distribution is normal
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