A Group of 100 Students Is Randomly Chosen and Divided

Multiple Choice

A group of 100 students is randomly chosen and divided into two groups. One group is taught typing using a set of new materials and the other using traditional methods. After instruction, typing speeds are compared to determine if the new materials improve learning. This type of study is a(n) :

A) comparative experiment.
B) observational study.
C) prospective study.
D) retrospective study.