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Chapter 5 · Data Analysis: A Concise Overview of Statistical Techniques · Slide 172/274

Measures of Dispersion

Measures of Dispersion

5.1.3 · Summarizing Data NumericallyMeasures of Dispersion

Measures of Dispersion

Variance is the average of squared deviations from the mean
Population Variance
(variance of the population)
σ² = ∑(xᵢ − μ)² / n
Sample
Variance
s² = ∑(xᵢ − x̄)² / (n − 1)
Carmelo Anthony – 6′8″+1½″Carlos Boozer – 6′9″+2½″Chris Bosh – 6′10″+3½″Kobe Bryant – 6′6″−0½″Dwight Howard – 6′11″+4½″LeBron James – 6′8″+1½″Jason Kidd – 6′4″−2½″Chris Paul – 6′0″−6½″Tayshaun Prince – 6′9″+2½″Michael Redd – 6′6″−0½″Dwayne Wade – 6′4″−2½″Deron Williams – 6′3″−3½″μ = 6′ 6½″Heights of the US basketball team (2008 Olympics)
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