Correlation doesn't guarantee causation, but the Asian countries where mask-wearing has been commonplace for a long time have done far, far, far better with this pandemic than nations where no one wears masks in public.
This is a vacuous statement in this context and adds nothing to the discussion, because you can never prove causation via a study/experiment, only reject the null hypothesis.
This is a vacuous statement in this context and adds nothing to the discussion, because you can never prove causation via a study/experiment, only reject the null hypothesis.