PSY 2073 Chapter 5 PowerPoint for PDF

PSY 2073 Chapter 5 PowerPoint for PDF - Chapter 5 Z-Scores...

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Chapter 5 Z-Scores: Location of Scores and Standardized Distributions
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Individual Scores Does an individual score have meaning? Requires mean and standard deviation to determine position What about comparing scores from different distribution?
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Standardization What is standardization? Changing unit of measurement to compare distributions Example: IQ Scores Z-scores X-value position/location Comparable distributions
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Z-Scores Purpose Exact position Comparisons Qualities Sign: Positive & Negative Number: Signals position from mean Example: IQ Distribution Same qualities regardless of distribution
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Z-Scores What is the z-score value for the following: A score 3 standard deviations above the mean A score ½ standard deviation below the mean A score 2 ¾ standard deviation above the mean A score 0 standard deviations above the mean
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Z-Scores What is the location of the following z-scores: Z = +1.00 Z = +1.50 Z = -0.25 Z = -3.00
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