3_Lecture3.1_CentralTendency_0126r_Spring11

3_Lecture3.1_CentralTendency_0126r_Spring11 - III. Central...

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1 PSY207 B Spring 2011 Psychological Statistics III. Central Tendency Objectives You should be able to. ... • Define the term measure of central tendency • Define and compute: • Mode • Median • Mean • Compare the measures of central tendency when distributions are skewed Central Tendency 3.1 Introduction Measures of Central Tendency • Measures that describe where the center of a distribution of scores is located • Measures that represent the most typical or most representative scores in a distribution • Three measures of central tendency • Mode • Median • Mean Central Tendency 3.1 Introduction 3.2 The Mean 3.3 The Median 3.4 The Mode
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2 Mode • The most frequently occurring score in a frequency distribution • Simplest measure of central tendency Example: Ratings for desirability of body piercing Survey 71 individuals on a 9 point scale 9 5 8 4 4 3 1 2 0 1 Rating Frequency 61 5 72 5 87 92 f = 71 Q: desirability of body piercing 1--2--3--4--5--6--7--8--9 Undesirable Desirable Extremely Undesirable Extremely Desirable Example: Ratings for desirability of body piercing 9 5 8 4 4 3 1 2 0 1 Rating Frequency 5 5 Extremely Undesirable Extremely Desirable Q: What is the mode?
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This note was uploaded on 04/20/2011 for the course PSY 207 taught by Professor Pfordesher during the Spring '07 term at SUNY Buffalo.

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3_Lecture3.1_CentralTendency_0126r_Spring11 - III. Central...

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