A recent survey of businesses found that companies with larger gross revenues typically spend more on transportation costs. What does the survey suggest about the relationship between these two quantities?
F Causation, without correlation
G Correlation, without causation
H Correlation, with causation
J Neither correlation nor causation



Answer :

G. There is definitely observable correlation. However, causation is not implied. In fact, there is probably a confounding variable: business scale. Larger business generate more revenue and have higher transportation cost. The correlation itself definitely does not imply companies pay more on transportation BECAUSE they have larger revenues.