Morris High School has introduced a policy designed to improve the working conditions of its new teachers. As a result of this policy, only one-quarter of all part-time teachers now quit during their first year. However, a third of all full-time teachers now quit during their first year. Thus, more full-time than part-time teachers at Morris now quit during their first year.
The argument's reasoning is questionable because the argument fails to rule out the possibility that Morris High School employs more new part-time teachers than new full-time teachers.