OG CR 171

fhr6568

171. A recent report determined that although only three percent of drivers on Maryland highways equipped their vehicles with radar detectors, thirty-three percent of all vehicles ticketed for exceeding the speed limit were equipped with them. Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not. The conclusion drawn above depends on which of the following assumptions? (A) Drivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not. (B) Drivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly than are drivers who are not ticketed. (C) The number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors. (D) Many of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report. (E) Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report. 答案B。我的理解是B说明sample代表全部，不知对不对？可是，我觉得A也有道理 - vechiles with radar detectors不容易被抓住，不是也证明结论吗？ 我感觉这题我没有抓到筋，下次可能还错。请指教解题思路，谢谢

kuuiytt

这个题目我的思路是，题目有2个PREMISE：1。3%的车有RADAR，2，33%的被抓的车有RADAR，CONCLUSION：有RADAR的车容易超速，比较2个PREMISE可以看出题目应该基于的假设是被抓的人就是容易超速的人。 A，并没有把超速和被抓联系起来，太只是解释PREMISE2的一种可能的原应。 不对的地方请指教！