PSYC 2301 Lecture 3: Chapter 3 Notes
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Tools you will need: summation notation (chapter 1, frequency distributions (chapter 2) A single score to define the center of a distribution: purpose: find the single score that is most typical or best represents the entire group. Central tendency measures: figure 3. 1 shows that no single concept of central tendency is always the. Best : different distribution shapes require different conceptualizations of center , choose the one which best represents the scores in a specific situation. 3. 2 the mean: the mean is the sum of all the scores divided by the number of scores in the data, population, sample: The weighted mean: combine two sets of scores, three steps: Determine the combined sum of all the scores. Divide the sum of scores by the total number of scores. Characteristics of the mean: changing the value of a score changes the mean.
