The new highway reduced commuting times: average commuting times in the region fell by 6 percent in the year after it opened.
Which one of the following would be most useful to know in evaluating the argument?
Answer and explanation
Correct answer: A. Whether commuting times also fell on routes that do not use the highway
- Step 1: A fall everywhere would suggest another cause. Step 2. Comparing with other routes tests the claim. Answer: whether times fell on other routes too. Why not the others: these do not test the cause.
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