Table 24 Comparison between the study sample responses depending upon the year that the workers installed the solar systems in their house

Environmental benefit

 Between groups

0.902

2

0.451

0.474

0.626//

 Within groups

34.235

36

0.951

 The total

35.137

38

Initial solar system cost

 Between groups

0.755

2

0.377

0.469

0.629//

 Within groups

28.938

36

0.804

 The total

29.692

38

Economic savings

 Between groups

2.05

2

1.025

1.671

0.202//

 Within groups

22.087

36

0.614

 The total

24.137

38

The total

 Between groups

1.113

2

0.556

0.871

0.427//

 Within groups

23.01

36

0.639

 The total

24.123

38