A recent study1examined several variables on collegiate football players, including the variableYears, which is number of years playing football, and the variableBrainSize, which is volume of the left hippocampus in the brain measured in L. The figure below shows a scatterplot of these two variables along with the regression line. For each of the following cases, estimate from the graph the number of years of football, the predicted brain size, the actual brain size, and the residual.

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