Pure Water Ltd. is expanding its market in the African continent, especially in Nigeria, Kenya, and South Africa.

Required: Develop a seasonal sales forecasting model using the historical sales data provided. Hint: use multiple regression analysis. Predict the next year's sales and compute standard errors of the forecasts.

Historical Sales Data:

Sales, thousands of liters	Year	Calendar Month
4600	1	1
4650	1	2
4700	1	3
4750	1	4
4800	1	5
4850	1	6
4900	1	7
4950	1	8
5000	1	9
5050	1	10
5100	1	11
5150	1	12
5200	2	13
5250	2	14
5300	2	15
5350	2	16
5400	2	17
5450	2	18
5500	2	19
5550	2	20
5600	2	21
5650	2	22
5700	2	23
5750	2	24
5800	2	25
5850	3	26
5900	3	27
5950	3	28
6000	3	29
6050	3	30
6100	3	31
6150	3	32
6200	3	33
6250	3	34
6300	3	35
6350	3	36