3_Cent_Tend

# 3_Cent_Tend - CentralTendency A variable is something that...

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Central Tendency

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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).
Central Tendency refers to the Middle of  the Distribution

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Middle of the Distribution Mode Most common score Median Top from bottom 50 percent Mean Arithmetic mean or average (Common Statistics)
Mode The most frequently occurring score. Can have bimodal and multimodal distributions. Modal psychology student is female. Modal number of pubs from grad school is zero. π

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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
Mean

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