习题：
　　Exercise:
　　The Error term represents the portion of the:
　　A     Dependent variable that is not explained by the independent variables.
　　B     Dependent variable that is explained by the independent variable(s).
　　C     Independent variables that are explained by the dependent variable.
　　D     Dependent variable that is explained by the error in the independent variable(s)
　　解析：
　　Answer: A
　　Explanation: The error term represents effects from independent variables not included in the model. It could be explained by additional independent variables.
　　知识点：
　　Error Term of the Linear Regression Model
　　The linear regression model with a single regressor is as follow:
 
　　The error term εi contains all the other factors besides X that determine the value of the dependent variable.
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