A researcher is interested in the possible effect of teacher-student ratios on studentsʹ learning. She finds 10 fifth‐grade classrooms with 30-40 students per class and 10 others with 15-25 students per class. She discovers that there is a correlation between class size and student achievement. Which one of the following conclusions can we draw from this study?
A) Class size can help us predict school achievement.
B) Classes should be as small as is reasonably possible.
C)Classes should be as large as is reasonably possible.
D) The researcher has conducted a descriptive study.
