A study of high blood pressure treatments found that certain meditation techniques and the most commonly prescribed drugs are equally effective if the selected treatment is followed as directed over the long term. Half the patients given drugs soon stop taking them regularly, whereas eighty percent of the study's participants who were taught meditation techniques were still regularly using them five years later. Therefore, the meditation treatment is the one likely to produce the best results.
Which of the following, if true, most seriously weakens the argument?
People who have high blood pressure are usually advised by their physicians to make changes in diet that have been found in many cases to reduce the severity of the condition.
The participants in the study were selected in part on the basis of their willingness to use meditation techniques.
Meditation techniques can reduce the blood pressure of people who do not suffer from high blood pressure.
Some of the participants in the study whose high blood pressure was controlled through meditation techniques were physicians.
Many people with dangerously high blood pressure are unaware of their condition.
这个题出得好妙啊...
attention!!正确的理解题意和选项的intended meaning
题目:①方法A和方法B如果被正确directed且长期坚持使用,会得到同样的效果。②选择方法A的人没多会就放弃用了,选择方法B的人80%的人都继续坚持了。==》结论:方法B的最终效果肯定要更好
此处应当有一个前提:参与实验的人是随机抽取的,且是被随机分配的。
gap:如果参与实验的人被分配选择方法A还是B的时候是基于他们对B方法的偏好的话,那本身那些去B的就是很想用B,自然也就坚持下来了。但是如果那些选A的是本事对B不偏好的,但是也不偏好A的话,用几天A就放弃也是正常的。
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