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2. In our test score and class size study, Let PctEL and LchPct (the percentage of students receiving a free or subsidized school lunch) be

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2. In our test score and class size study, Let PctEL and LchPct (the percentage of students receiving a free or subsidized school lunch) be two control variables. Consider the following regression result where standard errors are in the parentheses. Testscore = 700.2 1.00 x STR 0.122 x PctEL 0.547 x LchPct. (5.6) {0.27) (0.033) (0.024) (a) State a reasonable exogenous assumption [in plain words} that allows an casual interpretation of the coeicient on STE. (b) Under the assumption you stated above, can we View 43.547 as the casual effect of receiving free lunch on test score? My

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