题目内容

在列联分析中，卡方分布的自由度为（）。

A. 行数
B. 行数与列数的乘积
C. 列数
D. 行数减 1 与列数减 1 的乘积

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当列联表中的两个变量相互独立时，计算的列相关系数为（）。

A. 1
B. 0
C. 大于 1
D. 小于 0

在列联分析过程中，应注意的问题有哪些？

方差分析和列联表分析的应用有哪些差异？

Work in pairs and complete the sentences.1. The best way to stay healthy, lose weight, and improve your brainpower is to ________________________________.2. Walking is good for protection against _ and has benefits for _ as well.3. If you can take a walk in a park or in the countryside, it will provide you with ________________________.4. Scientists estimate that walking as little as _ minutes a day will give greater protection against ill health.5. If you were to buy one piece of equipment to aid your walking programme, it should be a(n) __________________________________.