4_CT&Var - Central Tendency and Variability The two...

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Central Tendency and Variability The two most essential features of a distribution
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Variables have distributions A variable is something that changes or has different values (e.g., anger). A distribution is a collection of measures, usually across people. Distributions of numbers can be summarized with numbers (called statistics or parameters).
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Central Tendency refers to the Middle of the Distribution
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Variability is about the Spread
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1. Central Tendency: Mode, Median, The mode – the most frequently occurring score. Can have bimodal and multimodal distributions.
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Median Score that separates top 50% from bottom 50% Even number of scores, median is half way between two middle scores. 1 2 3 4 | 5 6 7 8 – Median is 4.5 Odd number of scores, median is the middle number 1 2 3 4 5 6 7 – Median is 4
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For grouped frequency data, median is the midpoint of the class interval that contains the median. 26/2=13 (between 13 & 14) CI 10-12. Class
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This note was uploaded on 05/21/2011 for the course PSY 3213 taught by Professor Staff during the Fall '08 term at University of South Florida.

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4_CT&Var - Central Tendency and Variability The two...

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