4 - Central Tendency

4 - Central Tendency - Chapter 4: Central Tendency • Most...

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Unformatted text preview: Chapter 4: Central Tendency • Most frequent shortcut for characterizing a distribution – Measure of Central Tendency – Single summary figure describing the central location of the whole distribution of scores • 3 most common – Mode ( Mo ) – Median ( Mdn ) – Mean (µ X or X) The Mode • Mode ( Mo ) : Score that appears with the greatest frequency – If had to guess a single value for a person in that group, mode would be the best guess Bar Diagram of Majors in a Psychology Class 1 2 3 4 5 6 7 8 Comm Educ Engr Finan Forest Nurs Psych Stat Undec Majors Properties of the Mode • Only measure of central tendency for nominal data • Easy to obtain (simply involves counting frequencies) • But – Not very stable (can vary from sample to sample) – May be more than one in a set of scores (bimodal distributions) – No good measure of variability to put with it The Median • Median ( Mdn ) : Value that divides distribution into two even halves (in terms of number of scores) – Another name for P 50 – Scores must first be rank-ordered The Median • If distribution has odd number of scores,...
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This note was uploaded on 04/17/2008 for the course PSY 201 taught by Professor Arthur during the Spring '08 term at Purdue.

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4 - Central Tendency - Chapter 4: Central Tendency • Most...

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