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An observation is influential for a statistical calculation if removing it would markedly change the result of the calculation. In the previous problem, Subject 15 is thought to be an influential observation in the y-direction, and Subject 18 is thought to be an influential observation in the x-direction. a. Remove Subject 15 (only) and re-compute the regression equation y-hat and the correlation r. b.Remove Subject 18 (only) and re-compute the regression equation y-hat and the correlation r. c. Remove both Subject 15 and 18 and re-compute the regression equation y-hat and the correlation r. Are either or both of these subjects influential for the correlation? Explain. Type your answer below