The following is an incomplete ANOVA table. Use this table to answer questions (28) through (32). 28). For the within groups, the degrees of freedom are: a). 6 b). 7 c). 8 d). 9 29). The sum of squares among groups is: a). 10 b). 25 c). 75 d). 100 30). The mean square error is: a). 1.333 b). 9.375 c). 25 d). 75 31). The value of the test statistic is: a). 1.333 b). 9.375 c). 12.5 d). 100 32). At the 5% significance level, the critical value is: a). 3.11 b). 4.46 c). 6.06 d). 8.65