1. (20 points) An electric company has the following average monthly price for a customer the past 10 months.

Month	Sale Price
1	174.52
2	169.90
3	165.38
4	163.63
5	165.46
6	168.10
7	168.45
8	165.67
9	164.12
10	170.2

• Computetheexponentiallysmoothedforecastwith= 0.40
• Theadjustedexponentiallysmoothedforecastwith=0.40and=0.30
• Thelineartrend lineforecast.
• ComparetheaccuracyofthethreeforecastsusingcumulativeerrorandMAD, and indicate which forecast appears to be most accurate.