Using the time series data in the table, respond to the following items.

Period	Sales
1	1001
2	1129
3	841
4	1044
5	1012
6	703
7	682
8	712
9	646
10	686
11	909
12	469
13	566
14	488
15	688
16	675
17	305
18	381

d-1.Compute all possible forecasts using a trend forecasting model using simple linear regression?(Round your answers to 2 decimal places.)

Period	Sales	Predicted Sales	Absolute error
1	1,001	?	?
2	1,129	?	?
3	841	?	?
4	1,044	?	?
5	1,012	?	?
6	703	?	?
7	682	?	?
8	712	?	?
9	646	?	?
10	686	?	?
11	909	?	?
12	469	?	?
13	566	?	?
14	488	?	?
15	688	?	?
16	675	?	?
17	305	?	?
18	381	?	?

d-2.What is the MAD?(Round your answer to 2 decimal places.) MAD = ?

d-3.What is the trend equation based on the regression analysis?(Round your answers to 2 decimal places.)

Sales = ? - ? time period

e.What is the predicted annual change of industry sales?(Round your answer to 2 decimal places.)

Predicted annual change of industry sales = ?

f.Predict sales for the next three periods.(Round your answers to 2 decimal places.)

	Predicted Sales
Sales (19)	?
Sales (20)	?
Sales (21)	?