Question: Suppose you have a data set that includes all of the professional athletes in a given sport over a given period of time, such as

Suppose you have a data set that includes all of the professional athletes in a given sport over a given period of time, such as all NFL football players during the 2008–2010 seasons, and you use regression to estimate a variable of interest. Are the inferences discussed in this chapter relevant? Recall that we have been assuming that the data represent a random sample of some larger population. In this sports example, what is the larger population—or is there one?

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