The Following Data Represent the Means for Each Treatment Condition

Multiple Choice

The following data represent the means for each treatment condition in a two-factor experiment. What pattern of results is shown in the data? $\begin{array}{c}\begin{array}{lll}\text { B1 } \\\\\text { B2 } \end{array}\begin{array}{ | l | l| } \hline \\ \mathrm { M } = 20 & \mathrm { M } = 20 \\\\ \mathrm { M } = 30 & \mathrm { M } = 50 \\\hline\end{array}\end{array}$

A) Main effects for both factors and an interaction
B) Main effects for both factors and no interaction
C) A main effect for factor A, no main effect for factor B, and no interaction
D) A main effect for factor A and an interaction but no main effect for factor B