dr. allen believed that his engineering students would achieve higher grades if they studied in groups…

dr. allen believed that his engineering students would achieve higher grades if they studied in groups rather than by themselves. to test this belief, he assigned one fluid mechanics class to meet in required study groups and another fluid mechanics class to study independently in single study rooms in the library. after doing this for 3 weeks, dr. allen gave everyone the same test on the material they had been learning in class during the required study time.\na the group that scored high; the group that scored low\nb the individual study groups; the group that scored high\nc the students who studied independently; the students who studied in groups\nd the students who studied in groups; the students who studied independently

dr. allen believed that his engineering students would achieve higher grades if they studied in groups rather than by themselves. to test this belief, he assigned one fluid mechanics class to meet in required study groups and another fluid mechanics class to study independently in single study rooms in the library. after doing this for 3 weeks, dr. allen gave everyone the same test on the material they had been learning in class during the required study time.\na the group that scored high; the group that scored low\nb the individual study groups; the group that scored high\nc the students who studied independently; the students who studied in groups\nd the students who studied in groups; the students who studied independently

Answer

Brief Explanations:

Dr. Allen is testing the effect of study method (group vs. independent) on grades. In an experiment, the experimental group is the one that receives the treatment (in this case, the treatment is the study method). The group that studies in groups is the experimental group as it's the method being tested for its effect (higher grades). The group that studies independently is the control group which serves as a baseline for comparison.

Answer:

D. The students who studied in groups; the students who studied independently