PSY 200 Lecture Notes - Lecture 5: Standard Deviation, Normal Distribution
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Chapter 5: z-scores: location of scores and standardized distributions. (cid:1445)a z-score specifies the precise location of each x value within a distribution. The sign of the z-score (+ or -) signifies whether the score is above the mean (positive) or below the mean (negative). The numerical value of the z-score specifies the distance from the mean by counting the number of standard deviations between x and . (cid:1446) Z-scores have three main functions: describe a single score in terms of a distribution, standardize entire distributions, compare two or more distributions. Chapter 5: z-scores // 19 sept. 2018 // page 1. Exact location is described by z- score regardless of units. Sign tells whether score is located above or below the mean. Number tells distance between score and mean in standard deviation units. A z-score of 1. 5 will always indicate 1. 5 sds above the mean. Algebra can show us how to get a raw score from a z-score.
