Below is the sales data for the past 29 quarters at Pineappl

Below is the sales data for the past 29 quarters at Pineapple Inc. Using a linear regression model, how many percent of the variation in sales can be explained by the time period (quarter)?

Note: Leave your solution in decimal form, such as 0.442 for 44.2%.

Quarter

Sales

1

270000

2

1190000

3

2315000

4

1703000

5

717000

6

6890000

7

4363000

8

3793000

9

5208000

10

7367000

11

8737000

12

8752000

13

8398000

14

14102000

15

16240000

16

18650000

17

20340000

18

17070000

19

37040000

20

35100000

21

26000000

22

26900000

23

47800000

24

37400000

25

31200000

26

33800000

27

51000000

28

43719000

29

35200000

Quarter	Sales
1	270000
2	1190000
3	2315000
4	1703000
5	717000
6	6890000
7	4363000
8	3793000
9	5208000
10	7367000
11	8737000
12	8752000
13	8398000
14	14102000
15	16240000
16	18650000
17	20340000
18	17070000
19	37040000
20	35100000
21	26000000
22	26900000
23	47800000
24	37400000
25	31200000
26	33800000
27	51000000
28	43719000
29	35200000

Solution