"A simple linear regression model was fitted with an intercept equal to -17 and slope equal to 2.37. Calculate the value of the residual when X = 11 and the observed value of Y at that value of X is 12. Use 2 decimal places. "
Got this question from a lecturer in an exam and nobody got it emailed her after and she said all the info was in the question.
Is the residual not the error in the observed minus the predicted value, and if so how do you get it if we are not given an observed value to start with.
My guess is just the increase in Y of 2.37 from where when x=11 y=9.07 to when x=12 y=11.44