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A researcher wants to measure the categorical variable of 'age range' for participants in a study. The initial draft options are '18-25', '25-35', and '35-50'. Revise these response options so that they are mutually exclusive, ensuring a 25-year-old's answer unambiguously falls into only one category.

Question: A researcher wants to measure the categorical variable of 'age range' for participants in a study. The initial draft options are '18-25', '25-35', and '35-50'. Revise these response options so that they are mutually exclusive, ensuring a 25-year-old's answer unambiguously falls into only one category.

Sample answer: The revised response options could be '18-24', '25-34', and '35-50'.

Key points:

  • Provides a revised set of age response options.
  • Ensures the new categories do not overlap at any number (e.g., eliminating the overlap at 25 and 35).
  • Ensures a respondent's answer will unambiguously fall into only one category.

Rubric: Full credit is given for any set of logically progressing age ranges that do not overlap (e.g., 18-24, 25-34, 35-50 or 18-25, 26-35, 36-50). The student must demonstrate an application of mutually exclusive categories where no age overlaps.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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