PSYC 210 - Central Tendency

PSYC 210 - Central Tendency - Central Tendency A. Measures...

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Central Tendency A. Measures of Central Tendency A measure of central tendency is a statistic that indicates the middle, center or average of a distribution; provides a single score to represent the entire group of scores. 1. Mean: Arithmetic average; takes into account the value of each and every score in the distribution; considered the balance point, or fulcrum, of the distribution M = N X Examples 1) Data set: 2, 3, 4, 5, 5, 5, 6, 6, 6, 7, 8, 9 2) Data set: 2, 3, 4, 5, 5, 5, 6, 6, 6, 7, 20, 21 2. Median: Score that divides the distribution in half such that half of the scores are greater and half of the scores are less than the median (Mdn) Median location = 2 1 + N = th score Put scores in order and count from one end to median location. The score at that location is the median. Examples: 1) Data set: 2, 3, 4, 5, 5, 5, 6, 6, 6, 7, 8, 9 2) Data set: 2, 3, 4, 5, 5, 5, 6, 6, 6, 7, 20, 21 3) Frequency distribution: X f 7 4 6 9 5 24 4 19 3 10 2 7 1 6 3. Mode: The most frequently occurring score in the distribution
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This note was uploaded on 02/23/2012 for the course WMST 101 taught by Professor Burns during the Fall '08 term at UNC.

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PSYC 210 - Central Tendency - Central Tendency A. Measures...

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