Short Answer

A research group is designing a study to examine if a correlation between a nation's coffee consumption and its academic output is spurious. Applying the methodological findings from the chocolate-Nobel Prize study, how should the researchers handle the variable of national wealth in their research design to prevent drawing a spurious conclusion?

Question: A research group is designing a study to examine if a correlation between a nation's coffee consumption and its academic output is spurious. Applying the methodological findings from the chocolate-Nobel Prize study, how should the researchers handle the variable of national wealth in their research design to prevent drawing a spurious conclusion?

Sample answer: The researchers must treat national wealth (per capita income) as a potential confounding third variable. They should measure national wealth and statistically control for it in their analysis (or match countries based on wealth) to ensure that any observed correlation between coffee consumption and academic output is not simply a product of wealthier nations having greater resources to invest in education.

Key points:

  • Identify national wealth/per capita income as a potential confounding third variable
  • Measure and statistically control for national wealth in the design or analysis
  • Isolate consumption habits from educational investment capacity to avoid a spurious correlation

Rubric: The response must explain that researchers should measure and statistically control for national wealth/per capita income in their design to rule it out as a confounding third variable that drives both consumption habits and academic resources.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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