Question: Below is a set of Holt-Winter's method calculations for predicting truck sales: m=1, alpha=0.3 beta=0.1, gamma= 8. There is annual seasonality (a season is 12

Below is a set of Holt-Winter's method

Below is a set of Holt-Winter's method calculations for predicting truck sales: m=1, alpha=0.3 beta=0.1, gamma= 8. There is annual seasonality (a season is 12 months). Year Period Month DL L T: St Ft 2017 58 Jan 9750.0 10742.2 66.4 0.91 9873.8 59 Feb 8477.0 10649.3 50.5 0.80 8914.8 60 Mar 9814.0 10744.9 55.0 0.91 9678.0 61 Apr 10684.0 10647.1 39.7 1.01 11212.7 62 May 11693.0 11010.9 72.1 1.05 10619.2 63 Jun 14439.0 112480 88.6 1.28 13756.4 64 Jul 9081.0 11055.3 60.5 0.83 9900.1 65 Aug 9781.0 11557.4 104.6 0.83 8637.1 66 Sept 10307.0 11175.3 56.0 0.94 11972.8 67 Oct 14800.0 11073.6 40.2 1.35 15526.2 68 Nov 7960.0 10194.3 -51.8 0.82 10991.3 69 Dec 6858.0 9734.4 -92.6 0.72 7920.4 2018 70 Jan 9438.0 98633 -70.4 0.95 8766.9 71 Feb 8487.0 10030.6 46.6 0.84 7851.6 72 Mar 10609.0 10480.1 0.99 9101.3 73 Apr 11282.0 10687.9 23.4 1.05 105924 74 May 12870.0 11181.0 70.4 1.13 11228.6 75 Jun 17811.0 120662 152 1.44 14347.8 76 Jul 12128.0 12926.9 222.8 0.92 10162.9 77 Aug 10161.0 194.5 0.80 10946.3 78 Sept 16359.0 14346.2 3230 1.10 12318.9 79 Oct 17796.0 14223 279.6 1.27 19740.1 80 Nov 11604.0 14393.4 267.4 0.81 11938.3 81 Dec 11517.0 15062.8 307.6 0.76 105527 2019 82 Jan 15925.0 15802.3 350.8 1.00 14561.2 83 Feb 13532.0 16155.9 351.1 0.84 13524.0 84 Mar 14648.0 15984.1 298.8 0.93 16377.6 85 Apr 15697.0 15897.6 260.3 1.00 17041.0 86 May 16653.0 15729.7 217.5 1.07 18266.5 87 Jun 15411.0 14382.8 61.0 1.14 22898.9 88 Jul 13534.0 14538.7 70.5 0.93 13243.8 89 Aug 12454.0 14906.9 100.3 116620 90 Sept 16300.0 14946.9 94.3 1.09 16521.1 91 Oct 23378.0 16054.6 195.6 1.42 19090.5 92 Nov 16975.0 17666.4 337.2 0.93 13153.8 93 Dec 15135.0 18611.4 398.0 0.80 13604.3 2020 94 Jan a. Calculate L77 (1.5 point) b. Calculate T72 (1.5 point) c. Calculate S89 (1.5 point) d. Forecast January 2020 (1.5 point)

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