Psychology professor: Applied statistics should be taught only by the various social science departments.
Psychology Professor
EVIDENCE: The various social science departments can best teach their respective students which statistical methodologies are most useful for their discipline, and how best to interpret collected data and the results of experiments.
CONCLUSION: Applied statistics should be taught only by the various social science departments.
Mathematics Professor
EVIDENCE: My applied statistics course covers much of the same material taught in the applied statistics courses in social science departments. In fact, my course uses exactly the same textbook as those courses!
CONCLUSION: Applied statistics should not be taught only by the various social science departments.
Evaluate
The mathematics professor challenges the psychology professor's recommendation but never considers the evidence put forward in it's support. That the math professor is teaching the same content does not mean that the math professor is as able to teach students in each of the social sciences which methodologies are most useful for their discipline, and how best to interpret collected data and the results of experiments.