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【简答题】
从生产同一产品的所有企业中随机抽选100家企业调查,若以y表示某一企业生产这种产品的单位成本(单位:元/百件),以x表该企业该产品产量(单位:百件),所得资料如下: =1000, =30, =2000, =20,y与x的相关系数 。 要求: (1)建立一元线性回归方程 ,回归方程的常数项a为___,自变量的系数b为___; (2)可以估计当产品产量为1500百件时,该产品产量的单位成本为___元;
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