Suppose we fit the simple linear regression model (with the usual assumptions) Y = ?0 + ?1 X + ? and get the estimated regression model ? = b0 + b1 X What aspect or characteristic of the distribution of Y does ? estimate? o the population mean number of Y values above the mean of Y when X = 0 o the total variability in Y that is explained by X o the value of Y for a given value of X o the increase in the mean of Y for a one-unit increase in X o the mean of Y for a given value of X
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