Undergraduate students in a biology class were randomly divi

Solution

Undergraduate students in a biology class were randomly divided into two groups. In the first group, students worked alone on a multiple-choice exam on material recently covered in the class. In the second group, students worked in teams of four on the same multiple-choice exam. The teams were encouraged to discuss the questions among themselves before answering questions. All exams were graded and returned to the students. Then all students worked alone on another multiple-choice exam on the same material as the first exam. Compare the mean scores of the two groups on the second exam. Which data design?

The class were randomly divided into two groups.

Then the Two independent groups are compared.

This is two independent samples design.