For the nine examples listed in the text above, think about the character of the simple linear regression model: (a) In examples one and three some obvious restrictions would be required on X to make the model relevant. What restrictions? (b) In which examples might the roles of X and Y be reversed? In which examples would it be obviously absurd to reverse the roles of X and Y? (c) In which examples might X reasonably be thought to CAUSE an effect on Y? If the “effect” is not causal, what kind of effect is there? (d) In which examples would X probably be a random variable?
For the nine examples listed in the text above, think about the character of the simple linear…
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