Question: The sample regression line is given as Y = 559.869 + 1.049X, + 2.448X2 Where Y = monthly sales (RM thousands) X1 = experience (years)

The sample regression line is given as Y = 559.869 + 1.049X, + 2.448X2 Where Y = monthly sales (RM thousands) X1 = experience (years) X2 = advertisement cost (RM thousands) Interpret the estimated partial coefficient of X1

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