In Exercises 8.11 to 8.14, some computer output for an analysis of variance test to compare means is given. a) How many groups are there?
8.11 Sauce DF SS MS F
Groups 3 360.0 120.0 1.60
Error 16 1200.0 75.0
Total 19 1560.0

8.12 Sauce DF SS MS F
Groups 4 1200.0 300.0 5.71
Error 35 1837.5 52.5
Total 39 3037.5