If a Psychologist Tests Whether a New Teaching Method Is

Multiple Choice

If a psychologist tests whether a new teaching method is more effective than the old one,the research hypothesis is that

A) the new teaching method is more effective than the old teaching method.
B) the old teaching method is more effective than the new teaching method.
C) there is no difference in effectiveness of the old and new teaching methods.
D) there is a difference in effectiveness between the two methods,but no prediction is made.