题目内容
x与y的相关系数为0.89，z与y的相关系数为-0.92，所以x与y的相关程度高。
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当回归系数大于零时，则正相关；当回归系数小于零时，则负相关。（ ）
单位成本y（元）与产量x（千件）变化的回归方程为y=78 -2x，这表示
下列关系中，属于正相关的是
1. She'd refused to consider a practical car with good gas ___________ and easy to park.2. It means she made it, and that I'm finally __________ 18 years of responsibilities.3. Her bathroom is an _______________ of damp towels, rusted shaving blades, hair in the sink, and nearly empty tubes of toothpaste.4. I _________________ through poems and essays, admiring high scores on tests and reading her name, printed or typed neatly in the upper right-hand corner of each paper.5. These are all things that we gave her. Suddenly, i feel very ___________.6. I _____________ and bring back the garbage bags from the car and the curb.7. I feel my throat tighten at the sadness in his voice. I try hard to ______________ my tears.8. Tokens of her childhood will _________ her. So will we, with open arms.9. She left the bedroom a ridiculous mess, the comforter on the floor, the sheets ______________.10. "Just __________________," I tell him. "Can you find some boxes for her stuff?"
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