Short Answer

A researcher collects 88 scores and finds that the sum of the squared differences from the mean is 2828. Apply the calculations described in the text to compute both the variance and the standard deviation for this dataset, showing your work.

Question: A researcher collects 88 scores and finds that the sum of the squared differences from the mean is 2828. Apply the calculations described in the text to compute both the variance and the standard deviation for this dataset, showing your work.

Sample answer: The variance is calculated as 28/8=3.5028 / 8 = 3.50. The standard deviation is the square root of this variance, which is 3.50=1.87\sqrt{3.50} = 1.87.

Key points:

  • Calculate variance by dividing the sum of squared differences by the number of scores (28/8=3.5028 / 8 = 3.50).
  • Calculate standard deviation by taking the square root of the variance (3.50=1.87\sqrt{3.50} = 1.87).

Rubric: The student must show the calculation for variance (28/8=3.5028 / 8 = 3.50) and the subsequent calculation for standard deviation (3.50=1.87\sqrt{3.50} = 1.87).

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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