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?
Definitions:
Personal Accountability
The willingness to take responsibility for one's own actions, decisions, and the subsequent outcomes or results.
Logical But Impractical Decisions
Decisions that make sense from a rational standpoint but are not feasible or practical in reality.
Increased Uncertainty
Refers to situations where there is a higher degree of unpredictability regarding the future or outcomes of events.
Group-Aided Decision Making
A process where decisions are made collectively by a group of individuals rather than by a single person, enhancing diversity of thought and perspectives.
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