Essay

Explain the conceptual meaning of a percentile rank and describe the step-by-step process used to calculate it for a specific score in a distribution.

Question: Explain the conceptual meaning of a percentile rank and describe the step-by-step process used to calculate it for a specific score in a distribution.

Sample answer: A percentile rank represents the percentage of scores in a distribution that are lower than a specific score. To calculate it, you first count the number of scores in the distribution that are lower than the target score. Then, you divide that count by the total number of scores in the distribution and multiply by 100100 to convert it to a percentage.

Key points:

  • Define percentile rank as the percentage of scores lower than a specific score.
  • Count the number of scores in the distribution lower than the target score.
  • Convert the count of lower scores to a percentage of the total number of scores.

Rubric: The answer must correctly define percentile rank as the percentage of scores lower than the target score. It must also list both steps of the calculation: counting the lower scores and converting this count to a percentage of the total number of scores.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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