Which of the following measures is merely a simple difference score?
a. Standard deviation = 2.41
b. Difference scores = –2, –2, –1, +2, and +3
c. Range = 8
d. Variance = 5.80
ANS: A
The simplest measure of dispersion is the range. In published studies, range is presented in two ways: (1) the range is the lowest and highest scores, or (2) the range is calculated by subtracting the lowest score from the highest score. In this form, the range is a difference score that uses only the two extreme scores for the comparison. The range is generally reported in published studies but is not used in further analyses.
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