1. Below is a set of Holt-Winter’s method calculations for predicting truck sales: m=1, alpha=0.2 beta=0.3, gamma=.7. There is annual seasonality (a season is 12 months).

Year	Period	Month	Dt	Lt	Tt	St	Ft
2020	22	Jan	16249.0	18688.3	18.0	0.87	19335.2
	23	Feb	18867.0	17687.1	13.3	1.07	22415.0
	24	Mar	23857.0	16454.7	7.5	1.45	29988.3
	25	Apr	16828.0	17166.0	10.7	0.98	14968.6
	26	May	19062.0	18379.6	16.4	1.04	15839.7
	27	Jun	22724.0	19490.3	21.5	1.17	19375.6
	28	Jul	15320.0	21071.6	28.7	0.73	12432.7
	29	Aug	16936.0	22305.5	34.4	0.76	14525.7
	30	Sept	21986.0	21730.3	31.5	1.01	23878.8
	31	Oct	30998.0	22144.7	33.3	1.40	29490.8
	32	Nov	22359.0	21725.9	31.2	1.03	23766.3
	33	Dec	20860.0	23017.7	37.1	0.91	17854.7
2021	34	Jan	24057.0	24642.9	44.5	0.98	20045.5
	35	Feb	23506.0	23774.7	40.2	0.99	26334.3
	36	Mar	27985.0		33.0	1.26	34528.4
	37	Apr	24416.0	23193.5	37.2	1.05	21855.4
	38	May	24262.0	23286.7	37.4	1.04	24093.2
	39	Jun	29924.0	24130.2	41.2	1.24	27194.0
	40	Jul	21738.0	26143.0	50.4	0.83	17573.7
	41	Aug	20417.0	26433.2	51.5	0.77	19887.9
	42	Sept	33280.0	28690.6	61.8	1.16	26796.3
	43	Oct	35817.0	27662.9	56.7	1.29	40247.5
	44	Nov	26057.0	26893.4	52.9	0.97	28527.3
	45	Dec	23742.0	26688.6		0.89	24420.2
2022	46	Jan	26259.0	26794.8	51.9	0.98	26104.5
	47	Feb	23995.0	25959.5	47.8	0.92	26543.2
	48	Mar	28421.0	24837.3	42.3	1.14	32693.9
	49	Apr	22357.0	23625.9	36.5	0.95	26190.9
	50	May	23488.0	23277.4	34.7	1.01	24653.4
	51	Jun	29631.0	23512.3	35.6	1.26	28909.4
	52	Jul	20594.0	23967.6	37.6	0.86	19580.2
	53	Aug	20051.0	24677.9	40.7	0.81	18541.6
	54	Sept	27466.0	24360.5	39.0	1.13	28672.6
	55	Oct	34778.0	25246.7	43.0		31591.7
	56	Nov	25839.0	25764.2	45.2	1.00	24503.2
	57	Dec	23053.0	25845.5	45.4	0.89	22959.9
2023	58	Jan

1. Calculate L36
2. Calculate T45
3. Calculate S55
4. Forecast January 2023.

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