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Explain why this proposed survey item is classified as a bipolar scale. Based on survey design best practices, decide how many points the scale should have to be most effective and explain the reasoning behind this decision.

Case context: A social psychologist is designing a survey to measure participants' attitudes toward a new community intervention program. They want to assess attitude along a spectrum ranging from extreme agreement to extreme disagreement. They construct a rating scale with the opposing endpoints 'Agree very much' and 'Disagree very much' but are undecided on the number of response options to provide.

Question: Explain why this proposed survey item is classified as a bipolar scale. Based on survey design best practices, decide how many points the scale should have to be most effective and explain the reasoning behind this decision.

Sample answer: This item is classified as a bipolar scale because it measures the participant's attitude along a dichotomous spectrum of agreement, ranging from a positive pole ('Agree very much') to a negative pole ('Disagree very much'). Based on survey design principles, the researcher should use a 77-point format because 77-point formats are typically the most effective for capturing responses along these types of dichotomous, bipolar spectra.

Key points:

  • Identifies that the scale measures a construct along a dichotomous spectrum (agreement vs. disagreement)
  • Classifies the scale as a bipolar scale
  • Recommends using a 77-point format
  • Explains that a 77-point format is typically the most effective for bipolar scales

Rubric: Full credit requires the student to explain that the scale is bipolar because it spans a dichotomous spectrum (agree vs. disagree) and to recommend a 77-point format because it is the most effective layout for capturing responses on a bipolar spectrum.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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