# Notes2 - Slide 1 Lab 2 Central Tendency and Variability...

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Slide 1 Lab 2: Central Tendency and Variability ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 2 Learning Objectives ± Describe Central Tendency ± Hand calculation of Mean, Median & Mode ± SPSS calculation of Mean, Median & Mode ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 3 Learning Objectives (2) ± Describe Dispersion ± Calculate range, SD and variance by hand ± Calculate them with SPSS ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________

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Slide 4 Central Tendency ± Central tendency means the middle of the distribution. Three main indicators: ± The Mode ± The Median ± The Mean ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 5 The Mode Defined ± The most frequently occurring score or category ± To calculate: find the most frequently occurring score. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 6 Calculating the Mode ± 11223334 5555555 6667789 ± The mode is 5 because there are 7 fives in the distribution. ± What is the mode for these data? ± 12345677778889 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
Slide 7 The Median Defined ± The middlemost score; separates the top 50 % of scores from the bottom 50% ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 8 Calculating the Median – Even # of scores ± If even number of scores, use the average of two middle scores ± 1 2 3 4 5 6 7 8 (Order) ± 2 2 3 3 4 5 5 6 (Number) ± Median is 3.5 = (3+4)/2 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 9 Calculating Median (Even) ± 1 2 3 4 5 6 7 8 (Order) ±

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Notes2 - Slide 1 Lab 2 Central Tendency and Variability...

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