Case Study

Explain the conceptual flaw in the health minister's policy proposal. How does the concept of a spurious correlation apply here, and what underlying variables is the minister failing to address?

Case context: A government health minister reads a report on the 2012 study showing a strong positive correlation (r=0.79r = 0.79) between a nation's per capita chocolate consumption and its number of Nobel laureates. Eager to boost their own country's scientific achievements, the minister proposes a policy to subsidize chocolate purchases for all citizens, arguing that this will directly cause an increase in the nation's Nobel Prize count.

Question: Explain the conceptual flaw in the health minister's policy proposal. How does the concept of a spurious correlation apply here, and what underlying variables is the minister failing to address?

Sample answer: The health minister's proposal is conceptually flawed because it conflates correlation with causation. The correlation between chocolate consumption and Nobel Prizes is a spurious correlation, meaning the statistical association is not causal but is instead driven by third variables such as national wealth (per capita income) and geographic location. The minister fails to address the true underlying factors that drive scientific achievement, which are investments in education and technology rather than chocolate consumption.

Key points:

  • Distinguish correlation from causation
  • Identify the chocolate-Nobel relationship as a spurious correlation
  • Explain that the correlation is driven by third variables, not a direct causal link
  • Identify wealth/per capita income and geography as the third variables
  • Explain that the minister fails to address actual drivers of achievement (education and technology investments)

Rubric: The student must explain that correlation does not equal causation, define how the chocolate-Nobel relationship is a spurious correlation driven by third variables, and identify that the minister is failing to address the true causal variables of national wealth and investments in education and technology.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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