Jane wants to examine how three different learning styles affect students' scores on the final exam. She planned to recruit three groups of subjects. However, it is difficult to do group randomization because of the conflicts in students' schedules. She then used students from three different sessions of the mathematics course instead.

Since there would be substantial learning effect from the testing, she only issued a testafterthe intervention and compared the final exam grades among the three class sessions.

What type of experimental design is used?

Pre-experimental - one shot design

Quasi-experimental - repeated measures design

Pre-experimental - static group comparison design

Quasi-experimental - pre and post nonrandom design

True experimental - posttest only design