A recent report determined that although only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors, 33 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 drvers 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－－weaken
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－－－无关
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－－－无关
e drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered by the report－－无关
题目的意思：3％的在马里兰的司机为车装雷达，33％的超速记录单的车都装有雷达。这是个数字题。你想啊：正常情况下，应该得出的结论是只有3％的超速记录单里的车装有雷达，现在的数字是33％。只能说明是不装雷达的人不超速，装雷达的车屡次超速，使得超速罚单的装雷达的车子的比例高达33％。
应该是这解释
-- by 会员 kazemi (2011/2/12 4:18:14)
A recent report determined that although only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors, 33 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 drvers 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－－weaken
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－－－无关
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－－－无关
e drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered by the report－－无关
题目的意思：3％的在马里兰的司机为车装雷达，33％的超速记录单的车都装有雷达。这是个数字题。你想啊：正常情况下，应该得出的结论是只有3％的超速记录单里的车装有雷达，现在的数字是33％。只能说明是不装雷达的人不超速，装雷达的车屡次超速，使得超速罚单的装雷达的车子的比例高达33％。
应该是这解释
-- by 会员 kazemi (2011/2/12 4:18:14)
清晰了，谢谢。。
因此，题干给出 “雷达车罚单偏多——>雷达车更易超速”， 假设是 “罚单多——>易超速”
-- by 会员 marque (2011/2/18 21:50:28)
