QUESTION 4 Estimate the population regression model: 3 TestScore=B+B STR +B Income + Lunch + B Income? +B Income + u 1 i i i i i where E[uISTR]=0 and predict TestScore at the sample median of all the right-hand side variables. What is the predicted TestScore (two decimal places)? i Note that in tutorial sessions we have done very similar exercises with the sample average of regressors instead of the sample median.