In the United States, of the people who moved from one state to another when they retired, the percentage who retired to Florida has decreased by three percentage points over the past ten years.Since many local businesses in Florida cater to retirees, this decline is likely to have a noticeably negative economic effect on these businesses.
Which of the following, if true, most seriously weakens the argument?
Florida attracts more people who move from one state to another when they retire than does any other state.
The number of people who move out of Florida to accept employment in other states has increased over the past ten years.
There are far more local businesses in Florida that cater to tourists than there are local businesses that cater to retirees.
The total number of people who retired and moved to another state for their retirement has increased significantly over the past ten years.
The number of people who left Florida when they retired to live in another state was greater last year than it was ten years ago.
作者: fujianaicd 时间: 2010-10-4 11:19
Percentage and Numbers
Golden Rule:
Decreased precentage doesn't mean decreased numbers if the total base number increases significantly.
建议 看看 The PowerScore GMAT Critical Reasoning Bible 里面有一章： Percentage and Numbers 讲的很详细~~~作者: 澹泓幽客 时间: 2010-10-4 11:27
我想问的是，D里面说的是总的人数增加，但是并没有说move到佛罗里达的增加，并不能seriously weaken啊。。。作者: fujianaicd 时间: 2010-10-4 12:04
In the United States, of the people who moved from one state to another when they retired, the percentage who retired to Florida has decreased by three percentage points over the past ten years
这句话中我们是否可以看成： （the people who moved from one state to Floria when they retired）/（the people who moved from one state to another when they retired） 这个percentage 在减少，如果分母significantly 变得很大，那么分子是不是也会变大？ 那就 weaken 了作者: 澹泓幽客 时间: 2010-10-4 16:37
哦~~~原来是这样，谢谢！