问题 单项选择题 A2型题

一次脑血栓研究中,一名医生访视200名病例,一名护士访视200名对照,病例和对照来自同一所医院,并按性别、年龄、种族进行配比,结果发现50%的病人血胆固醇含量高,而对照仅20%是血胆固醇含量高,差别有统计学意义。有人据此得出结论“脑血栓与血胆固醇有联系”,此推论()

A.正确

B.不正确,因为没有计算率

C.不正确,因为病例组和对照组在有关的特征上不可比

D.不正确,因为对统计学的意义的解释不确切

E.不正确,因为可能存在调查偏倚

答案

参考答案:E

解析:该研究由一名医生和一名护士分别调查病例和对照,这样很可能发生调查偏倚。调查偏倚可能来源于调查对象和调查者双方,由两个不同的人对病例和对照分别进行调查,很可能产生调查偏倚,从而导致结论的不正确。

选择题
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     Marriages improve after children grow up and move out, according to an academic study, which

suggests an "empty nest" is not always a bad thing.

     Popular wisdom has it that parents' relationships may suffer once their young fly the coop, because

they feel they have lost their purpose in life.However, a new study by researchers at the University of

California,  Berkeley, has found that many couples actually feel happier when their children leave home

because they are able to enjoy spending time together.

     In total,123 American mothers born in the 1930s were tracked for 18 years and asked to rate their

satisfaction levels shortly after marrying, when they were bringing up babies, once their children reached

their teenage years and finally at age 61, when almost all had "empty nests".

     Although not all said they were happier in general, most claimed their marriages had improved since

their children had left home.Researchers believe this is not just because the spouses were spending more

time together, but because they were able to enjoy each other's company more.

     One of the participants in the study, which is published in the journal Psychological Science, said:"

Once the kids grow up...there's some of that stress removed...that responsibility removed, so things are

a little more relaxed."

     Psychologist Sara Gorchoff, who carried out the investigation, said:"The takehome message for

couples with young children is 'hang in there'. " Her coauthor Oliver John added:"Don't wait until your

kids leave home to schedule quality time with your partner."

      However, Dr Dorothy Rowe, from the British Psychological Society, said the effects of living in an

"empty nest" will depend on the parents' relationship with their children."If you're just waiting for them

to leave home so you can get on with your life, then of course you'll be pleased to see them go, " she

said, "But if you've built your life around your children you'll be terribly lonely.For some parents, their

world falls apart when their children leave."

1. It is commonly believed that________.

A. marriages improve after children leave home

B. an "empty nest" is always a happy thing

C. parents' relationships may suffer once their young grow up and move out

D. parents will be pleased after their children leave home

2. When did many couples feel happier according to the study?

A. At age 61, when almost all had "empty nests".

B. Shortly after marrying.

C. Once their children reached their teenage years.

D. When they were bringing up babies.

3. Marriages improve after children fly the coop not because______.

A. many couples are able to spend time together

B. many couples are able to enjoy each other's company

C. things are a little more relaxed

D. many couples needn't work at all

4. The author of the passage tends to agree that________.

A. parents should build their life around their kids

B. parents should schedule quality time with each other before kids leave home

C. parents' relationship with their kids has no effect on marriages at all

D. parents should be pleased to see their kids leave home