CD22-14的GWD17-Q23没找到讨论过！！！！！！！！！！！

qianrene

GWD17-Q23:

Because visual inspection cannot reliably distinguish certain skin discolorations from skin cancers, dermatologists at clinics have needed to perform tests of skin tissue taken from patients.  At Westville
     Hospital, dermatological diagnostic costs were reduced by the purchase of a new imaging machine that diagnoses skin cancer in such cases as reliably as the tissue tests do.  Consequently, even though the machine is expensive, a dermatological clinic in Westville is considering buying one to reduce diagnostic costs.

 

 

 

 

Which of the following would it be most useful for the clinic to establish in order to make its decision?

 

 

 

 

1. Whether the visits of patients who require diagnosis of skin discolorations tend to be shorter in duration at the clinic than at the hospital
2. Whether the principles on which the machine operates have been known to science for a long time
3. Whether the machine at the clinic would get significantly less heavy use than the machine at the hospital does
4. Whether in certain cases of skin discoloration, visual inspection is sufficient to make a diagnosis of skin cancer

5. Whether hospitals in other parts of the country have purchased such imaging machines

我选的D，TOOTOO答案给的是C，请问为什么啊？？？？D：：如果他们引进的机器不足以确定癌症的话，还需要进行取样测试，就达不到to reduce diagnostic costs的目的啊

[此贴子已经被作者于2007-10-13 19:53:09编辑过]

Whitney

GWD17-Q23:

Because
visual inspection cannot reliably distinguish certain skin
discolorations from skin cancers, dermatologists at clinics have needed
to perform tests of skin tissue taken from patients.  At Westville Hospital,
dermatological diagnostic costs were reduced by the purchase of a new
imaging machine that diagnoses skin cancer in such cases as reliably as
the tissue tests do.  Consequently, even though
the machine is expensive, a dermatological clinic in Westville is
considering buying one to reduce diagnostic costs.

Premise:             At Westville Hospital, A leads to B

Conclusion:   a dermatological clinic, A will lead to B;

Assumption:  The situation (machine, patients, etc...) in a dermatological clinic is identical  (or  more  favor)  to that at
                Westville Hospital ;

So C is right answer; D is irrelevant.

D's assumption is that the machine used in a dermatological clinic is at least as accurate as that used in Westville Hospital; howevre, in the argument, author uses one to refer to the same type of machine (a dermatological clinic in Westville is
considering buying one. )

 

            

mindfree

很久没有解答逻辑题了，试试看是不是还明白。

这个问题是问cost和machine的关系。在hospital，皮肤科大夫通过这种machine降低了成本（和原始的skin test相比）。如果在clinic，大夫使用这种machine的频率和hospital相当，presumably，成本也会降低。这里还有一个基本的经济学原理。machine是fixed cost，不随output的改变而改变。output越高，average fixed cost的越低，成本就越低。C就是说考虑output （usage）。

qianrene

谢谢两位大师，也就是说诊所不会因为医术没有大医院高明而出现机器操作不当，判断不出来的现象是吧？另外diagnostic costs不只是说用了新设备，原来旧设备的cost就没有了，还指新设备的cost，如果利润不足以弥补这个新设备的cost，那么这个diagnostic cost就不能降低，谢谢哈！

mindfree

It has nothing to do with the old machine. Assume the cost is 100. If the hospital used it 20 times a week, the cost each time is 5. The problem indicates that the hospital reduced cost, thus 5 is lower than the original cost. If the clinic uses the machine as heavily, the cost should also be reduced.

xlyun

Whitney  就是人才

rpch2004

以下是引用mindfree在2007-10-15 8:45:00的发言：

很久没有解答逻辑题了，试试看是不是还明白。

这个问题是问cost和machine的关系。在hospital，皮肤科大夫通过这种machine降低了成本（和原始的skin test相比）。如果在clinic，大夫使用这种machine的频率和hospital相当，presumably，成本也会降低。这里还有一个基本的经济学原理。machine是fixed cost，不随output的改变而改变。output越高，average fixed cost的越低，成本就越低。C就是说考虑output （usage）。

难得一见的mindfree的中文帖

时间的沙漏

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feiyuwuhen12

弱弱的问一句，A为什么不对啊？

yzhao26

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