Topic 6: Standard Scores
A. The Z-score. Generic Form: Z = (X – Mean) / SD or . There is a . population. version. Z = (X - µ) / σ or . And there is a . sample. version. Z = (X – X-bar) / SN-1 or. Interpretation of the Z score. Z tells us . how many standard deviations X is above or below the mean. Selected Z’s Interpretation +3 X is 3 SDs above the mean +2 X is ... ................
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