6) The monthly demand for a given product is given by the table below. Month Demand 1 68 2 75 3 73 4 69 5 70 6 72 7 68 8 71 9 70 10 73 11 69 a) Draw the graph for the demand b) Calculate the demand forecast for the period 12 using the exponential smoothing with alpha equal to 0.1 c) Calculate the demand forecast for the period 12 using the exponential smoothing with alpha equal to 0.6 d) What happens to the demand forecast when I use alpha equal to 0.1 and then alpha equal to 0.6? e) Check that the model generates acceptable errors