The accompanying data resulted from an experiment to investigate whether yield from a certain chemical process depended either on the formulation of a particular input or on mixer speed. Speed
60 70 80
189.7 185.1 189.0
1 188.6 179.4 193.0
190.1 177.3 191.1
Formulation
165.1 161.7 163.3
2 165.9 159.8 166.6
167.6 161.6 170.3
A statistical computer package gave SSsFormd 5 2253.44, peedd 5 230.81, SSsForm*Speedd 5 18.58, and SSE 5 71.87.
Does there appear to be interaction between the factors?