# l2f03 - Lab2 CentralTendency andVariability...

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Lab 2: Central Tendency  and Variability

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Learning Objectives Describe Central Tendency Hand calculation of Mean, Median & Mode SPSS calculation of Mean, Median & Mode
Learning Objectives (2) Describe Dispersion Calculate range, SD and variance by hand Calculate them with SPSS

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Central Tendency Central tendency means the middle of the distribution. Three main indicators: The Mode The Median The Mean
The Mode Defined The most frequently occurring score or category To calculate: find the most frequently occurring score.

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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
The Median Defined The middlemost score; separates the top  50 % of scores from the bottom 50%

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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
Calculating Median (Even) 1 2 3 4 5 6 7 8 (Order) 1 2 2 2 2 3 3 3 (Number)

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