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Given the following sample data, Complete parts a and b. 

Based on the computations for the within- and between-sample variation, develop the ANOVA table and test the appropriate null hypothesis using alpha =0.01.

b. If warranted, use the Tukey-Kramer procedure to determine which populations have different means. Use a=0.01.

Item Group 1 Group 2 Group 3 Group 4
1 19.1 29.5 18.7 21.6
2 27.1 24.7 17.6 24.2
3 24.6 23.2 18.7 18.8
4 22.2 30.2 20.7 16.8
5 25.1 31.9 15.2  
6 29.8 24.1    
7 24.9