> In any case, the simplest hypothesis is that all animals can feel pain. The null hypothesis should be the opposite. Following the interpretation that "The nu

> In any case, the simplest hypothesis is that all animals can feel pain. The null hypothesis should be the opposite. Following the interpretation that "The null hypothesis is generally assumed to be true until evidence indicates otherwise." I'd argue for H° being that all living beings feel pain until evidence indicates otherwise. That approach wouldn't be very economical though which is why do the opposite.