You are interested in whether smoking potentially influences birth weight of babies. Suppose you estimate the following regression model 1: bweight; = do + acigs; + azfaminc; + ci (1) where "bweight" represents a child's weight at birth (in ounces), "cigs" is the number of cigarettes smoked per day by the mother while she was pregnant, and "faminc" is the total family income (in thousands of US dollars). a) The correlation between the two independent variables is -0.173. Provide an intuition about this statistic. (2 marks)