问题
多项选择题
使用方差分析的前提是( )。
A．每个水平总体的分布都是正态分布
B．各总体的均值相等
C．各总体的方差相等
D．每个水平总体的分布都是t分布
E．数据相互独立
答案
参考答案：A,C,D
解析： 方差分析的前提假设包括：每组试验数据都服从正态分布，每组数据的方差是相等的，数据之间是相互独立的。所以答案为ACD。
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使用方差分析的前提是( )。
A．每个水平总体的分布都是正态分布
B．各总体的均值相等
C．各总体的方差相等
D．每个水平总体的分布都是t分布
E．数据相互独立
参考答案：A,C,D
解析： 方差分析的前提假设包括：每组试验数据都服从正态分布，每组数据的方差是相等的，数据之间是相互独立的。所以答案为ACD。
| 阅读理解。 | |||||||||||||||||||||||||||
| Stress is everywhere in our everyday life. Not only men have it, but also women and young people. The most important reasons of stress are: death, diseases, exams, making money, getting married, moving houses, changing jobs, ending friendships and so on. How do you know whether you have stress? Could you give your answers to the following questions? Stress Test | |||||||||||||||||||||||||||
what can you do about it? Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving (减轻) stress. However, doctors now say that there are easier ways-people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should cry more often, because crying is the natural way of relieving stress. | |||||||||||||||||||||||||||
| 1. Which of the following is NOT the reason of stress? | |||||||||||||||||||||||||||
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| A. Taking exams. B. Changing jobs. C. Taking sleeping pills. | |||||||||||||||||||||||||||
| 2. According to the passage,which of the following is true? | |||||||||||||||||||||||||||
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| A. Only women and young people have stress. B. Stress is everywhere in our everyday life. C. People who answer"No" to all of the questions have great stress. | |||||||||||||||||||||||||||
| 3. Which is not the usual way of relieving stress? | |||||||||||||||||||||||||||
[ ] | |||||||||||||||||||||||||||
| A. Talking with friends. B. Listening to light music. C. Taking medicine. | |||||||||||||||||||||||||||
| 4. The easier way to relax your body is _____. | |||||||||||||||||||||||||||
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A. Laughing,smiling and crying | |||||||||||||||||||||||||||
| 5. The main idea of the passage is _____. | |||||||||||||||||||||||||||
[ ] | |||||||||||||||||||||||||||
| A. about stress and how to relieve your stress B. that there are many reasons for having stress C. that laughing and smiling more can help relieve your stress |