3_Lecture3.2_CentralTendency_0128r_Spring11(1)

3_Lecture3.2_CentralTendency_0128r_Spring11(1) - Central...

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1 PSY207 B Spring 2011 Psychological Statistics Central Tendency 3.1 Introduction 3.2 The Mean 3.3 The Median 3.4 The Mode 3.5 Selecting a Measure for Central Tendency 3.6 Central Tendency and the Shape of the Distribution The Mode •The mode is the score or category that has the greatest frequency of any in the frequency distribution • Can be used with any scale of measurement • Suggest to use with data in nominal scale • Corresponds to an actual score in the data • It is possible to have more than one mode Figure 3.1 AB C Mode = 5 Mode = 8 Mode = 2 and 8 Median, Mean, and Middle Mean is the balance point of a distribution • Defined by distances • Often is not the midpoint of the scores • Suggest to use with data in interval/ratio scale Median is the midpoint of a distribution • Defined by number of scores • Often is not the balance point of the scores • Suggest to use with data in ordinal scale Both measure central tendency, using two different concepts of “middle” Figure 3.1 C
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3_Lecture3.2_CentralTendency_0128r_Spring11(1) - Central...

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