A cellular company operates three branch offices in the same city. To test for differences in the effectiveness of the sales personnel at the different branches, independent samples of the average dollar amounts of sales (in thousands) for personnel are taken and analysis with a 5% level of significcance.
Anova: Single factor
Group Count Sum Average Variance
A 6 213 35.5 49.1
B 6 217 36.16 29.36
C 5 223 44.6 8.8
D 6 207 34.5 74.7
Required:
What degrees of freedom should be used to find the critical value of the test statistic?