3%的车装有雷达检测器；而所有被开罚单的车中33%有按雷达监测器；因为如果开罚单与安装雷达监测器无关,那抽取的开罚单的车中应该也有3%左右的车安装雷达监测器,同安装雷达的车和总车数的比应该是大致一样的.但是实际上是33%.所以推断：Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.
但是之前的推断只说明安装雷达监测器与开罚单有关系,而结论是关于exceed the speed limit regularly的.也就是开罚单就表明车辆经常超速.这是题目能够得出结论的隐藏假设.
