Exhibit 11.3: The following graphs show the results of two studies comparing the effect of instructional Methods A and B in large and small social studies classes.The dependent variable was scores on a standardized social studies test.

-Refer to Exhibit 11-3.Which graph shows interaction but no main effects?
A) graph (a)
B) graph (b)

Question

Exhibit 11.3: The following graphs show the results of two studies comparing the effect of instructional Methods A and B in large and small social studies classes.The dependent variable was scores on a standardized social studies test.
 
-Refer to Exhibit 11-3.Which graph shows interaction but no main effects?
A) graph (a) 
B) graph (b)

Quizplus · Accepted Answer

Graph B shows interaction between instructional method and class size, as the lines for Methods A and B cross each other. However, there are no clear main effects for either instructional method or class size, as the lines appear to be relatively parallel.