A tire company claims that its tires last longer than a competitor's, citing a test in which its tires lasted 10,000 miles longer on the company's own test track.
Which one of the following, if true, most seriously weakens the claim?
Answer and explanation
Correct answer: D. The smooth test track is much gentler on tires than ordinary roads are
- Step 1: A gentle track may exaggerate the lifetime on real roads. Step 2. The result may not apply to ordinary use. Answer: the track is gentler than roads. Why not the others: these do not undermine the test.
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