Changes in one variable on a graph might be caused by the other variable on the graph or by a third omitted variable.
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Q129: When a variable that is not named
Q130: If a line passes through the points
Q131: Figure 2-12 Q132: The slope of a line is the Q133: Two variables that have a negative correlation Q135: As a substitute for laboratory experiments, economists Q136: When a variable that is named on Q137: Two variables that have a positive correlation Q138: Figure 2-12 Q139: Like biologists and physicists, economists use the
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