Central-notes

# Central-notes - Last Lecture • Visual presentation of...

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Unformatted text preview: Last Lecture • Visual presentation of data (graphs) • Shapes of distributions • Examples and review Today • Measures of central tendency – mode – median – arithmetic mean • Properties of each statistic • Summation notation • Relationships Psy 320 Central Tendency, 1 Definition “Central tendency” • summarizes all the scores in a sample. • “most characteristic” score Psy 320 Central Tendency, 2 Three common statistics • Mode • Median • Arithmetic mean (average) Psy 320 Central Tendency, 3 The mode Definition : the mode of a sample is the most frequently occuring score. Think of it as the “most likely” score. Psy 320 Central Tendency, 4 The frequency polygon The mode is the point at which the frequency polygon is highest: 1 2 3 4-1 1 2 3 4 5 6 7 8 9 10 11 Psy 320 Central Tendency, 5 Properties The mode is • not always unique. • unstable. • the only appropriate measure of central tendency { 24 , 34 , 34 , 48 , 60 , 73 , 75 , 77 , 80 , 81 , 86...
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Central-notes - Last Lecture • Visual presentation of...

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