This study did not study male and female teachers independently, so this does support the claim that female teachers are any different (or worse) than male teachers.
Furthermore, it is notoriously difficult to get to causation from correlation. If you'd like to read more about this, check out Judea Pearl's work.
Furthermore, it is notoriously difficult to get to causation from correlation. If you'd like to read more about this, check out Judea Pearl's work.