The following time series shows the sales of a particular product over the cast 12 months. Month Sales Month Sales 145 1 8 3 120 105 90 120 100 80 100 110 5 h 11 12 b. Construct a time series plot. What type of pattern exists in the data? Use a 0.3 to compute the exponential smoothing values for the time series, Use trial and error to find a value of the exponential smoothing coefficient a that results in a relatively small MSE