(Lesson 6: Measures of Spread or Variation; 3-3) 3.20 Step 4 : VAR, or σ 2 = the average of the squared deviations = 520.8 5 = 104.16 square points One reason why we often prefer the SD over the VAR is that units like “square points” are not natural to us. Step 5 : SD, or = VAR = 104.16 ≈ 10.2 points Observe that the SD shares the same units as the original data values. Many calculators have a or N button that allows you to compute the
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