Calculating Standard Deviation (sample)


                           s=
                                      ∑( Xi − X ) ...
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Calculating Standard Deviation (Sample)

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Calculating Standard Deviation (Sample)

  1. 1. Calculating Standard Deviation (sample) s= ∑( Xi − X ) 2 SS n −1 Step 1: Calculate Sum of Squares SS = ΣX2 – (ΣX)2 /N Square each score and then add Add up all the scores, square the up all the squared scores sum, divide by the sample size Step 2: Plug in SS (what you got above) into the numerator of the standard deviation formula s = √ SS n–1 Step 3: Interpretation (On average, observations in the sample are (insert standard deviation) units away from the sample mean of (insert mean).

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