对于相关—回归分析预测法，下列表述正确的是（） A.如果求出的相关系数R是负值，则可
题型：单项选择题
问题：
对于相关—回归分析预测法，下列表述正确的是（）
A.如果求出的相关系数R是负值，则可能是负相关
B.如果求出的相关系数R≤0.49，则因变量与自变量之间无相关关系
C.分析两种现象之间因果关系称为回归分析
D.相关分析属于定性分析预测
题型：单项选择题
| 从方框内选择适当的单词并用其正确形式完成句子（每词只能选用一次）。 | |
2. He couldn’t forget his _________ time to feed pigs. 3. He has always dreamed about _______ a basketball player like Yao Ming. 4. —Oh, you are looking so tired. What happened? —I ran a long way without _______. 5. Be sure to watch your  bags _______. 6. Give me a call as soon as you _______ there. 7. Difficulties can make us feel _______ and be more hopeful about the future. 8. Sweat (汗) wet through his clothes  and _______ from his forehead. 9. There is something wrong with the old woman’s eyes, so she did everything very________. 10. Several _______ of eyes looked at the young man and his face  turned red. |
drop, careful