JJ 加油站题有疑问 请NN帮忙！！

Ginger儿

22.【加油站刺激生意】by 牛与鸡 （710 Q51 V34）
Last August the XT chain of gasoline stations had a temporary sales promotion in effect. In the promotion, any customer who made a purchase of ten or more gallons of gasoline was entitled to a free car wash. For the month of August, XT experienced a ten percent increase in gasoline sales as compared to sales in August the previous year, so evidently the promotion was successful as a means of boosting sales.
In evaluating the argument, it would be most helpful to answer which of the following?
A.    In the areas in which XT’s gasoline stations operate, how did total combined gasoline sales for all gasoline stations last August compare with sales for the previous August?
B.    Was the money that XT earned from the increase in gasoline sales enough to offset the cost of providing free car washes during the promotion?
C.    Were there any customers who bought ten or more gallons at an XT gasoline station during the promotion who would have or more gallons at an XT gasoline in lower quantities, but more frequently, if the promotion had not been in effect?
D.    Did XT or any of its gasoline stations have to pay other businesses to provide the car washes that customers were offered in the promotion?
E.    Are XT’s gasoline sales in August usually significantly higher than one twelfth of XT’s annual gasoline sales?

为什么不能选B呢？

kikisunflower

结论：sales promotion促进了汽油销售

验证结论的现象：今年8月汽油销量（促销后）>去年8月汽油销量

让这种比较准确的关键点，就是控制除促销以外的，其他影响销量的变量，即排除他因。答案找控制其他变量的选项。

A. 指出应验证整个大环境下汽油销量的变化，即控制宏观变量。因为如果汽油市场整体走俏，销量增长是行业的普遍现象，就很难说明XT销量的增长是促销的功劳。

B. 讲的是sales是否能弥补cost，其实就是说profit的问题了，和比较的准确性无关，无关选项

Ginger儿

结论：sales promotion促进了汽油销售

验证结论的现象：今年8月汽油销量（促销后）>去年8月汽油销量

让这种比较准确的关键点，就是控制除促销以外的，其他影响销量的变量，即排除他因。答案找控制其他变量的选项。

A. 指出应验证整个大环境下汽油销量的变化，即控制宏观变量。因为如果汽油市场整体走俏，销量增长是行业的普遍现象，就很难说明XT销量的增长是促销的功劳。

B. 讲的是sales是否能弥补cost，其实就是说profit的问题了，和比较的准确性无关，无关选项

-- by 会员 kikisunflower (2011/5/13 12:16:58)

ok明白了！！谢谢！！！祝你成功