19

20

21

22

23

24

25

26

27

28

Total

Mean

Standard deviation

Variable coefficient

Sale + 2

0.40

0.02

9.60

0.38

0.02

9.60

9.98

10.00

10.00

10.00

60.00

6.00

4.99

0.83

Sale + 1

4.80

0.19

9.61

0.97

0.04

9.60

10.56

11.52

12.48

13.44

73.22

7.32

5.30

0.72

Begin

9.60

1.92

9.68

2.00

0.08

9.60

11.52

13.44

15.36

17.28

90.50

9.05

5.92

0.65