I think that 80 children is too small. The different results could been biased by the fact that there were different classes, so different (possibly) skill levels of the students.
I think that 80 children is too small. The different results could as been biased that there were different classes, so different (possibly) skill levels of the students.
I think that 80 children is too small. The different results could been biased by the fact that there were different classes, so different (possibly) skill levels of the students.
I think that 80 children is too small. The different results could as been biased that there were different classes, so different (possibly) skill levels of the students.