For one academic year all the students at a high school were observed  The aim was to test the hypothesis that studying more increased a student' s chances of earning a higher grade  It turned out that the students who spent the most time studying did not earn grades as high as did many students who studied less
In each course, the more a student studied, the better his or her grade was in that course.
 Nonetheless, the researchers concluded that the results of the observation supported the initial hypothesis