A study found coffee drinkers live longer. The researchers conclude coffee extends life. Which one of the following most weakens the researchers’ conclusion? A) The coffee drinkers in the study also exercised more on average. B) Some participants drank decaf instead of regular coffee. C) The study was funded by a coffee trade group. D) Tea drinkers were not included in the study. E) The participants were all over age fifty.

A) The coffee drinkers in the study also exercised more on average.

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Weaken question · #26 of 60

A study found coffee drinkers live longer. The researchers conclude coffee extends life.

Which one of the following most weakens the researchers’ conclusion?

Show explanation

Exercise, not coffee, could account for the longer lives.

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Last updated October 12, 2026