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2. Use Caschool dataset to finish the following questions: (a) generate a binary variable indicating whether a schooling district in the CASchools data set has a student-teacher ratio below 20. (b) Use Im() to regress Y on D, i.e., estimate the coefficients in the model. (c) Start by drawing a visually appealing plot of the observations on Y and D. 2. Use Caschool dataset to finish the following questions: (a) generate a binary variable indicating whether a schooling district in the CASchools data set has a student-teacher ratio below 20. (b) Use Im() to regress Y on D, i.e., estimate the coefficients in the model. (c) Start by drawing a visually appealing plot of the observations on Y and D