问一道题：NO.PZ201512020300000801

问题如下：

Which of Vasileva’s assumptions regarding regression analysis is incorrect?

选项：

Assumption 1

Assumption 2

Assumption 3

解释：

C is correct. The assumptions of the linear regression model are that the 1) the relationship between the dependent variable and the independent variable is linear in the parameters b0 and b1; 2) the independent variable is not random; 3) the expected value of the error term is 0; 4) the variance of the error term is the same for all observations; 5) the error term is uncorrelated across observations; and 6) the error term is normally distributed. Assumption 3 is incorrect because the expected value of the error term is assumed to be zero, not equal to the mean of the dependent variable.