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A mattress company has two stores, one in City X and the other in City Z. The company has advertised equally in newspapers in both cities, but has advertised twice as much on the radio in City Z as in City X. The two cities have similar populations and economies and the sales at each store have been roughly equal. A consultant claims this shows that the radio advertising has not improved mattress sales. In the table below, select changes that the company could make in City X and City Z, respectively, that together would probably be most helpful in testing the consultant’s claim. Make only two selections, one in each column.

City X	City Z
Double newspaper advertising	Double newspaper advertising	Double newspaper advertising
Eliminate newspaper advertising	Eliminate newspaper advertising	Eliminate newspaper advertising
Eliminate radio advertising	Eliminate radio advertising	Eliminate radio advertising
Change the content of radio advertising	Change the content of radio advertising	Change the content of radio advertising
Add television advertising	Add television advertising	Add television advertising

正确答案： 3,3

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知识点/逻辑关系
此题涉及因果关系分析和实验控制变量的逻辑。需要设计实验来验证“广播广告未提升床垫销量”这一说法，关键在于通过改变广播广告这一变量，同时控制其他广告因素，观察销量变化。解析
为测试顾问说法，应使两城市除广播广告外其他广告条件相同。城市X和城市Z报纸广告原本相同，所以可在城市X和城市Z都“Eliminate newspaper advertising”（取消报纸广告），然后在城市Z“Eliminate radio advertising”（取消广播广告），城市X保持广播广告现状，对比销量变化来判断广播广告对销量的影响。故城市X选“Eliminate newspaper advertising”，城市Z选“Eliminate radio advertising” 。

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