Given the following sample data, complete parts a and b. Click the icon to view the sample data. a. Based on the computations for the within- and between-sample variation, develop the ANOVA table and test the appropriate null hypothesis using a = 0.01. Use the p-value approach. b. If warranted, use the Tukey-Kramer procedure to determine which populations have different means. Use a = 0.01. a. Complete the ANOVA table. Source of Variation SS ANOVA df MS F P Between groups 3 Within groups Total 175.9 18 21 (Round to four decimal places as needed.) Sample Data Item Group 1 Group 2 Group 3 Group 4 1 19.5 28.4 17.6 20.2 2 25.6 24.3 14.8 23.5 3 28.4 23.3 17.3 19.6 4 21.7 31.3 21.7 17.5 5 23.5 30.5 15.3 6 28.3 24.2 7 23.2