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4_Variability

# 4_Variability - Variability (CommonStatistics Range...

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Variability

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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.)

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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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4_Variability - Variability (CommonStatistics Range...

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