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2017年6月英语四级作文卖自行车(sell a bicycle you used at college)

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website to sell a computer you used at college. Your advertisement may include its brand, specifications/features, condition and price, and your contact information.You should write at least 120 words but no more than 180 words. Write your essay on Answer Sheet 1.
2017年6月英语四级作文真题：卖电脑

从散点图上可以看出员工人数与产量有任何关系吗？

什么是回归系数？它的统计含义是什么？

度量用估计回归方程能够解释的变化比重的指标称_______。