The Standard Deviation Is Most Commonly Used to Get a Sense

question 16

Multiple Choice

The standard deviation is most commonly used to get a sense of how far the typical score of a distribution differs from the mean.In computing the standard deviation, why is it necessary to square the deviations from the mean for each score?

• A) The deviations are too small to have a variance without being squared.
• B) There is no variability in the deviations of the scores prior to squaring.
• C) Squaring numbers is a required step in calculating all measures of variability.
• D) The deviations sum to zero due to negative and positive values.

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