Read the following study and answer the questions asked.-

In an attempt to determine which method would assure the best class attendance, an educational psychologist had one teacher reward students for attending class with extra points, a second teacher punish absences by deducting points, a third teacher scold students for absences and a fourth teacher do nothing. Results indicated that attendance was best in the first class where the teacher rewarded the students.

a. Specify whether the following study is Correlational or Experimental.

Give explanation for your answer.
Specify the Independent and dependent variables.