109. Several studies have shown that hospitals are not all equally successful: patients are much more likely to die in some of them than in others. Since the hospitals in the studies had approximately equal per-patient funding, differences in the quality of care provided by hospital staff are probably responsible for the differences in mortality rates.
Which one of the following, if true, casts the most doubt on the conclusion drawn above? B
(A) The staff in some of the hospital studies had earned more advanced degrees, on average, than the staff in the other hospitals.
(B) Patient populations vary substantially in average severity of illness from hospital to hospital.
(C) The average number of years that staff members stay on at a given job varies considerably from one hospital to another.
(D) Approximately the same surgical procedures were performed in each of the hospitals covered in the studies.
(E) Mortality rates for hospital patients do not vary considerably from one region of the country to another.
我想问下到底什么才叫无关选项呢？我觉得A也可以是使死亡率变化的原因啊~~~反正只要不是care quality 导致的死亡率应该都能削弱结论啊，A怎么不行啊~到底什么是无关选项呢？
我的分析如下：
题目说：结论：医院不一样的死亡率是由于staff提供的quality造成的。reason:因为每个病人提供的钱是差不多的（即rule out 了一个可能性）。assumption:造成死亡率不一样的eith per-patient funding or qulity provided by staff
assumption有问题：可能还有其他的造成死亡率不一样的原因， if mortality is caused by the illness of the patient.题目的结论就被削弱了
A 的话无关，员工赚的钱和死亡率有关吗，我（staff）今天股票涨了（earned），多赚了点，那医院的病人死亡的概率就小了？
文章已近踢出了 funding 的影响
欢迎讨论……
A好像是医生的学历更高吧，要是那样的话很可能死亡率就是因为有些医生资历不够导致的呀，但是我后来想想觉得我把自己的想法加进去了，违背了大脑空白原则
学历高和quality不是一回事。所以无关。
如果Ａ是学历高的话，那就是支持了文章的结论啊
结论：因为每个ｓｔａｆｆ 提供的ｑｕａｌｉｔｙ不一样导致了死亡率不一样
A的高学历正好支持了，每个staff的quality不一样是由于学历导致的
A is right. 死亡与病重直接相关，
B 死与学历不紧密相关，老医生比博士蛙不差吧。说的是医德，不是医术问题，可是另有他因，所以消弱了医德问题。
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