Data Set 13-4: the Number in Each Cell Is the Mean

Multiple Choice

Data Set 13-4: The number in each cell is the mean of 5 participants on the Loose Label Political Opinion Poll (high scores = liberal, low scores = conservative) .
$\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$$\text { Socioeconomic Status }$
$\begin{array}{clccc} & & \text { Low } & \text { Medium } & \text { High } \\\text { Major in } & \text { Humanities } & 50 & 20 & 50 \\\text { College } & \text { Nat. Science } & 30 & 60 & 30\end{array}$

-In Data Set 13-4, an example of a main effect is

A) political attitudes
B) socioeconomic status
C) whether scores for humanities majors depend on socio-economic status
D) none of the other alternatives are correct.