excel data:

Week	Sales
1	5548.6100
2	5687.6600
3	5466.2100
4	5668.0900
5	5552.7300
6	5665.0000
7	5441.4900
8	5333.3400
9	4977.9900
10	5163.3900
11	5191.2000
12	5582.6000
13	5267.4200
14	5228.2800
15	5076.8700
16	5387.9300
17	5147.9400
18	5067.6000
19	5123.2200
20	5035.6700
21	5213.8600
22	4868.8100
23	5264.3300
24	5546.5500
25	5187.0800
26	5014.0400
27	5188.1100
28	5514.6200
29	5168.5400
30	5362.1800

The owner of a convenience store near Salt Lake City in Utah has been tabulating weekly sales at the store, excluding gas. The accompanying data file contains the sales for 30 weeks. a. Use the 3-period moving average to forecast sales for the 31st week. Note: Do not round intermediate calculations. Round final answer to 2 decimal places. b. Use simple exponential smoothing with a=0.3 to forecast sales for the 31st week. Note: Do not round intermediate calculations. Round final answer to 2 decimal places. c-1. Report the performance measures for the techniques in parts a and b. Note: Do not round intermediate calculations. Round final answers to 2 decimal places