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Correlation 9

# Correlation 9 - Correlation Review Interpretation SPSS 1...

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1 Correlation Review Interpretation SPSS

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2 Z-scores: Review Puts all scores on the same scale Tells us how far and in what direction a score is from the mean Positive if above the mean Negative is below the mean Mean of z-scores is always 0 Standard deviation of z-scores is always 1
3 Raw score X = 4.25 Mean = 3.25 Deviation from the mean X – M = 1.00 Average deviation from the mean sd = 1.00 z-score puts scores in standard deviation units z = (X-M)/sd = 1.00 How many standard deviations above or below the mean? (z)(sd) = (1.00)(1.00) = 1.00 Number of standard deviations from the mean + mean = raw score (z)(sd) + M = X 1.00 + 3.25 = 4.25

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4 Raw score X = 3.00 Mean = 4.50 Deviation from the mean X – M = -1.5 Average deviation from the mean sd = 2.00 z-score puts scores in standard deviation units z = (X-M)/sd = -.75 How many standard deviations above or below the mean? (z)(sd) = (-.75)(2.00) = -1.5 Number of standard deviations from the mean + mean = raw score (z)(sd) + M = X -1.5 + 4.50 =3.00
5 Raw score X = 5.00 Mean = 3.25 Deviation from the mean X – M = 1.75 Average deviation from the mean sd = 1.48 z-score puts scores in standard deviation units z = (X-M)/sd = +1.183 How many standard deviations above or below the mean? (z)(sd) = (1.183)(1.48) = 1.75 Number of standard deviations from the mean + mean = raw score (z)(sd) + M = X 1.75 + 3.25 = 5.00

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6 Z-scores are in standard deviation units Raw score X M = 3.25 sd = 1.48 Z-scores are in sd units How much
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Correlation 9 - Correlation Review Interpretation SPSS 1...

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