In a study of 500 people, those who drink tea daily lived longer. The researchers conclude that drinking tea extends life.
Which one of the following, if true, most seriously weakens the researchers' conclusion?
Answer and explanation
Correct answer: D. The tea drinkers were also more likely to exercise and avoid smoking
- Step 1: Exercise and not smoking are known to lengthen life. Step 2. They may explain the result instead of the tea. Answer: tea drinkers also exercised and avoided smoking. Why not the others: these do not give another cause.
Practise more Assumptions, Strengthening and Weakening.
Free questions with an explanation for every one, and full timed LSAT (Law School Admission Test) mock tests.
More Assumptions, Strengthening and Weakening questions
- Ms. Alvarez argues that the city's bike-share program has reduced traffic congestion, because the number of cars entering the downtown area…
- People who keep houseplants in their offices report lower stress than people who do not. A researcher concludes that houseplants reduce stre…
- A bakery owner concludes that her new slogan raised sales, because sales were 10 percent higher in the month after the slogan was introduced…
- Every member of the committee who attended the retreat voted for the plan. Mr. Chen voted for the plan. Therefore Mr. Chen attended the retr…
- Scientists hypothesize that a certain fungus is killing the frogs in Pond X.
Which one of the following, if true, most strengthens the hypo… - The crime rate in the town fell after the new police chief took office. This shows that she is an effective chief.
Which one of the followi…