A company providing on-line teaching software claims that students who are on-line

students achieve better results on learning programming languages than on campus students. The company has developed a hypothesis based on this claim. The company chose one university to conduct research to test this hypothesis. It applied for research ethics clearance and at the same time included both on-line and on campus students to participate in this experiment.

At the end of semester, all students undertook the same exam on programming languages. The company used final scores of all students to test its hypothesis. The company has published a report in which it concludes "the average score of 67 for on-line students is higher than the average score of 65.5 for on campus students, and so we can conclude that on-line students achieve better results in learning programming languages than on campus students. Therefore, this teaching method should be used for all students in future."