4_Variability - Variability Variability refers to the...

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Unformatted text preview: Variability Variability refers to the Spread or Dispersion of the Distribution Variability of the Distribution Range Max - min Variance Average Squared Distance from Mean Standard Deviation Average Distance from Mean (Common Statistics) (Verbal definitions of Variance and Standard Deviation are not exactly right, but close enough to right and easy to remember.) Range Maximum minimum. Quick, easy. 2, 3, 4, 5, 5, 5, 6, 7. Range is 7 2 = 5 2, 3, 4, 5, 5, 5, 6, 19. Range is 19 2 = 17 What is the range for the distribution shown in the boxplot? 18 N = VAR00001 9 8 7 6 5 4 3 2 1 Variance Population Variance: Where means population variance, means population mean, and the other terms have their usual meaning. The variance is equal to the average squared deviation from the mean. To compute, take each score and subtract the mean. Square the result. Find the average over scores. Ta da! The variance....
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This note was uploaded on 05/21/2011 for the course PSY 3204 taught by Professor Brannick during the Spring '10 term at University of South Florida - Tampa.

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4_Variability - Variability Variability refers to the...

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