Automobile Dealer's Advertisement:
The Highway Traffic Safety Institute reports that the PZ 1000 has the fewest injuries per accident of any car in its class. This shows that the PZ 1000 is one of the safest cars available today.
Which of the following, if true, most seriously weakens the argument in the advertisement?
The Highway Traffic Safety Institute report listed many cars in other classes that had more injuries per accident than did the PZ 1000.
In recent years many more PZ 1000s have been sold than have any other kind of car in its class.
Cars in the class to which the PZ 1000 belongs are more likely to be involved in accidents than are other types of cars.
The difference between the number of injuries per accident for the PZ 1000 and that for other cars in its class is quite pronounced.
The Highway Traffic Safety Institute issues reports only once a year.
枚举推理(样本→总体)。前提:据报道PZ1000 比任何同级别的车在每一次事故中有更低的伤害 结论:PZ1000 是当今最安全的车之一
问题:如何削弱 潜在的削弱方向:1.样本代表性:任何同级别的车的挑选有没有问题 2.其它样本:还有很多其他车比PZ 1000更安全,设最安全的标准是1,P是2,P的同级别的车大于等于2,其它非同级别的车都是0.
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