9.3 A new security system was installed at the Platia Clothing Store eight weeks ago. The numbers of items stolen from the store in the period since are:

Week 1 2 3 4 5 6 7 8 Items stolen 63 56 49 45 51 36 42 37

(a) Use the exponential smoothing model with a smoothing constant of 0.8 to predict values of the series to week 9.

(b) Plot the series and the forecasts on the same graph.