Use the Following to Answer Questions

Multiple Choice

Use the following to answer Questions
A researcher is looking at the effects of competition versus cooperation on mathematics learning. She theorizes that anxiety will interact with type of instruction to influence math learning. The dependent variable is the number of points on a 100 point mathematics test. The means for the study results are shown in the table below.

-Which of the following pairs of means is indicative of the main effect of Instruction type?

A) 45 vs 75
B) 50 vs 70
C) 25 vs 65
D) 75 vs 75