An experimenter finds that students in a morning class perform better on a math test after being taught with a new teaching method compared with students in an afternoon class who are taught with a standard teaching method.He concludes that the new teaching method is superior to the old method.The main problem with this experimenter's conclusion is:

Question

Quizplus · Accepted Answer

The main problem with the experimenter's conclusion is that he did not consider the time of day that students were being taught. This is important because the students in the morning class might have performed better simply because they were being taught at a time when they were more alert and focused than the students in the afternoon class. This means that the result may not actually be due to the new teaching method, but rather to the time of day that the students were being taught. Therefore, the experimenter's conclusion that the new teaching method is superior to the old method is not necessarily valid.

An Experimenter Finds That Students in a Morning Class Perform