There're the four groups.
20.9

1

27.2

1

26.6

1

22.1

1

25.3

1

30.1

1

23.8

1

28.2

2

26.2

2

21.6

2

29.7

2

30.3

2

25.9

2

17.8

3

15.9

3

18.4

3

2.02

3

14.1

3

21.2

4

23.9

4

19.5

4

17.4

4

1. Based upon the computation for the in and between sample variation, make the ANOVA table and test the appropriate null hypothesis using the Pvalue approach.
2.If warranted use TukeyKramer procedure to find out which populations has different means. Use
α = 0.05