Essay

Describe the mathematical steps required to calculate the variance and standard deviation of a dataset based on the process described in the text.

Question: Describe the mathematical steps required to calculate the variance and standard deviation of a dataset based on the process described in the text.

Sample answer: To calculate the variance, you first determine the squared differences from the mean and average them. To calculate the standard deviation, you take the square root of the calculated variance.

Key points:

  • Determine the squared differences from the mean.
  • Average the squared differences to calculate the variance.
  • Identify that the variance is the average of these squared differences.
  • Take the square root of the variance to find the standard deviation.

Rubric: The response must accurately state both steps: first, determining and averaging the squared differences from the mean to get the variance; second, taking the square root of the variance to find the standard deviation.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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