A Bar Graph Displays the Mean Scores on a Test

Multiple Choice

A bar graph displays the mean scores on a test of mental rotation for students majoring in psychology or chemistry who have either high or low spatial abilities.Psychology and chemistry students with low spatial skills scored about 35 percent correct on the mental rotation test, while psychology and chemistry students with high spatial skills scored about 70 percent correct.What can be inferred from these data?

A) There is an interaction between spatial ability and college major.
B) There appears to be a main effect of mental rotation only.
C) There appears to be a main effect of college major only.
D) There appears to be a main effect of spatial ability only.