Dispersion refers to how spread out/clustered a set of scores is around the mean

Standard deviation is a way to understand and compare distribution of scores without having to actually plot and examine each and every score

When comparing standard deviations, any particular standard deviation is a reflection of the underlying scale

Standard deviations cannot be compared when scales have different numbers of options

Look at page 403 for the standard deviation formula

This is what SPSS is used for...

	Created by Roxanne V Springman about 9 years ago

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