If you hypothesize that there will be a difference between test scores from Classroom A and Classroom B,but you do NOT hypothesize the direction,you have ______.

A) a directional research hypothesis
B) a nondirectional research hypothesis
C) a null hypothesis
D) either a null or research hypothesis

A nondirectional research hypothesis predicts only that there will be a difference between the two groups being compared, without specifying the direction of the difference. A directional research hypothesis would specify the direction of the difference (e.g. Classroom A will score higher than Classroom B). A null hypothesis states that there will be no difference between the two groups being compared. The answer cannot be D because a null hypothesis is a distinct type of hypothesis and cannot also be a research hypothesis.