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(4) An electrical contractor's records during the last five weeks indicate that the number of job requests were as follows: 5 Week: No. of Job Requests: 1 20 2 17 3 18 4 21 24 Forecast the number of job requests for week 6 using a: (a) 2-week simple moving average method [1.5 points) (b) 3-week simple moving average method [1.5 points] (c) 4-week simple moving average method [1.5 points] (d) the weighted 2-week moving average method with a weight of 0.6 assigned to the most recent week [2 points) (e) the exponential smoothing method, given that forecast for week 5 was 24 and the smoothing parameter is 0.1. [2 points] (f) If the actual number of job requests in week 6 was 19, which of the above five (5) procedures [from parts (a), (b), (c), (d) and (e) above) yields the best forecast? Explain your reasoning. [1.5 points)