问题
单项选择题
两变量（x和y）作相关分析时，算得r=0.38，可以说（）。
A.x和y无关，因r值较小
B.x和y相关不很密切，因r值不到1
C.不能确定x和y的相关密切程度，因不知n的大小
D.虽然x和y相关，但不能认为x和y有因果关系
E.可以认为x和y存在直线相关关系
答案
参考答案：C
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两变量（x和y）作相关分析时，算得r=0.38，可以说（）。
A.x和y无关，因r值较小
B.x和y相关不很密切，因r值不到1
C.不能确定x和y的相关密切程度，因不知n的大小
D.虽然x和y相关，但不能认为x和y有因果关系
E.可以认为x和y存在直线相关关系
参考答案：C
| 用所给单词和短语的适当形式填空。 | |
2. The ____ to the movie was five dollars. 3. This new invention will bring you great ____ like a goldmine. 4. This is the school that ____ a hero where he spent his childhood. 5. On the outskirts of the city, we saw many ____ bungalows (平房). 6. Coral is not a plant but animal life of ____ different shapes and bright colours. 7. Our train ____ Beijing Station on time. 8. Just imagine how horrible the world would be if' human is the only ____ in the world. 9. Take a camera and ____ the nature in your summer holiday. 10. We're in the ____ more people are against us than with us. |