QUESTION TEXT: A year ago the government reduced the…
QUESTION TYPE: Necessary Assumption
CONCLUSION: We can reduce traffic fatalities by lowering speed limits.
REASONING: Last year the government lowered speed limits and traffic deaths declined.
ANALYSIS: This argument makes a causation-correlation error. It presents no evidence that the speed limit change caused the decrease in traffic deaths. That could have been a coincidence.
- If highway traffic increased then the argument would be even stronger. We would expect more accidents if there are more drivers.
- The argument would still be ok if 49% of drivers (not a majority) obeyed the speed limit.
Most people do in fact disobey highway speed limits. But they’ll drive slower if the limit is lowered, even if they still go above the limit.
- This is very tempting. But it says “number of automobile accidents”. The conclusion talks about fatalities. You can be in an accident but not die.
- The argument would be ok if the new speed limit was only enforced at the same level of strictness as the old speed limit.
- CORRECT. If this were true then we shouldn’t be surprised that fatalities fell. They probably would have fallen even without the reduction in the speed limit.
Free Logical Reasoning lesson
Get a free sample of the Logical Reasoning Mastery Seminar. Learn tips for solving LR questions