问题
单项选择题
回归分析时，要求（）。
A.X、Y均服从正态分布
B.X服从正态分布
C.Y服从正态分布
D.X、Y均服从对称分布
E.以上都不对
答案
参考答案：C
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回归分析时，要求（）。
A.X、Y均服从正态分布
B.X服从正态分布
C.Y服从正态分布
D.X、Y均服从对称分布
E.以上都不对
参考答案：C
| 阅读下面短文，把A-D 四个选项填在空白处（1-4），并完成第5题。 |
| Qu yuan, an official and a famous poet lived about 2,000 years ago. As a kind, wise and patriotic (爱国的) man, he was loved by the common people (百姓). 1. When people heard that Qu threw himself in the Miluo River, they were very sad and went there quickly in order to save his life. 2. In the Chinese culture, dragon means power and authority (权威), so fishermen used dragon boats to scare the fish away from Qu's body. They also threw Zong Zi, or rice dumplings, into the water to feed the fish. 3. But they were too late. Qu Yuan died. From then on, people hold Dragon Boat (龙舟) races, eat Zong Zi on the anniversary (纪念日) of Qu Yuan's death: the fifth day of the fifth lunar (农历的) month. 4. |
| A. They hoped that when the fishes were full, they would keep away from Qu yuan. B. A lot of fishermen rushed out in long dragon-shaped boats. C. Qu Yuan's life was sad and he killed himself by jumping into the Miluo River. |
| 5. What's the best title for the Passage? |
[ ] |
| A. A story of Qu Yuan B. Qu yuan's poems C. The coming of Dragon Boat race and Zong Zi eating D. A festival |