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A simple linear regression model was fitted to two variables: Y, the response variable and X, the explanatory variable. A scatter plot of Y versus

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A simple linear regression model was fitted to two variables: Y, the response variable and X, the explanatory variable. A scatter plot of Y versus X as well as the residual plot after fitting the least squares regression line to the data are given below. 4 3.5 3 2.5 2 1.5 1 0.5 2 4 6 8 10 X 1.5 1 0.5 Residuals 10 -1 15 X

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