Are the following observational study or an experiment? a. …

Are the fоllоwing оbservаtionаl study or аn experiment? a.  A teacher divides their class into 2 groups, one groups does traditional homework with pen and paper and the other group does their homework on-line. A the end of the term the grades of the two groups are compares.?   [answer1] b.   A medical researcher obtains a sample do adults who have diabetes.  She polls all of them to determine how their lifestyle impacts with their diabetes. [answer2]