Which of the following measures is the most helpful both for providing a quantification of dispersion and for providing a way to interpret how far away from the mean each individual score is?
a. Standard deviation
b. Difference scores
c. Range
d. Magnitude
ANS: A
Measures of dispersion, such as the range, difference scores, variance, and standard deviation, provide important insight into the nature of the data. The standard deviation is an important statistic, both for understanding dispersion within a distribution and for interpreting the relationship of a particular value to the distribution.
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