The Following Data Represent the Means for Each Treatment Condition $\quad$

Multiple Choice

The following data represent the means for each treatment condition in a two-factor experiment. Note that one mean is not given. What value for the missing mean would result in NO interaction between A and B? $\quad$$\quad$$\quad$$\quad$$\text {B1 }$$\quad$$\quad$$\quad$$\text {B2 }$
$\begin{array}{c}\begin{array}{lll}\text { A1 } \\\\\text {A2 } \end{array}\begin{array}{ | l | l| } \hline \\40\quad \quad&60\quad\quad \\\\20 & 40 \\\hline\end{array}\end{array}$

A) 0
B) 10
C) 20
D) 40