United States, Inc., supplies milk to several independent grocers throughout Dade Country, Florida. Managers at United Dairies want to develop a forecast of the number of half gallons of milk sold per week. Sales data for the past 12 weeks are:

Week	Sales	Week	Sales
1	2750	7	3300
2	3100	8	3100
3	3250	9	2950
4	2800	10	3000
5	2900	11	3200
6	3050	12	3150

a.Construct a time series plot. What type of pattern exists in the data?

b.Use exponential smoothing with = 0.4 to develop a forecast of demand for week 13. What is the resulting MSE?