Essay

According to the provided text about the 2012 study, what was the exact correlation coefficient (rr) found between a nation's per capita chocolate consumption and its number of Nobel laureates? Identify the specific third variables and the areas of national investment that explain why this statistical relationship is considered a spurious correlation.

Question: According to the provided text about the 2012 study, what was the exact correlation coefficient (rr) found between a nation's per capita chocolate consumption and its number of Nobel laureates? Identify the specific third variables and the areas of national investment that explain why this statistical relationship is considered a spurious correlation.

Sample answer: The 2012 study found a strong positive correlation of r=0.79r = 0.79 between per capita chocolate consumption and the number of Nobel laureates. This relationship is spurious because it is driven by third variables: a country's geographic location and wealth. European nations with higher per capita income tend to both consume more chocolate and invest more heavily in education and technology, explaining the correlation without a direct causal link.

Key points:

  • State the correlation coefficient of r=0.79r = 0.79
  • Identify geographic location and wealth/per capita income as third variables
  • Mention that wealthier/European nations consume more chocolate
  • Mention that wealthier nations invest more heavily in education and technology

Rubric: Full credit is awarded if the student correctly states the correlation coefficient (r=0.79r = 0.79), identifies geographic location and wealth/per capita income as the driving third variables, and identifies education and technology as the specific areas of investment.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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