Your textbook states that correlation of the error term across observations "will not happen if the data are obtained by sampling at random from the population." However, in one famous study of the electric utility industry, the observations were listed by the size of the output level, from smallest to largest. The pattern of the residuals was as shown in the figure. What does this pattern suggest to you?

Question

Your textbook states that correlation of the error term across observations "will not happen if the data are obtained by sampling at random from the population." However, in one famous study of the electric utility industry, the observations were listed by the size of the output level, from smallest to largest. The pattern of the residuals was as shown in the figure.  What does this pattern suggest to you?

Quizplus · Accepted Answer

The Answer of Your textbook states that correlation of the error term across observations "will not happen if the data are obtained by sampling at random from the population." However, in one famous study of the electric utility industry, the observations were listed by the size of the output level, from smallest to largest. The pattern of the residuals was as shown in the figure.  What does this pattern suggest to you?

Your Textbook States That Correlation of the Error Term Across