4 - Central Tendency

4 - Central Tendency - Chapter 4 Central Tendency Most...

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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)

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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 0 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

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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

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