A correlation of r = -0.90 means that there is essentially no consistent relationship between X and Y

Nicotinic and muscarinic receptors are two types of ___ receptors

A) tobacco B) serotonin C) acetylcholine D) dopamine

In laboratory studies, as in the real world, what types of groups usually end up with the fewest rewards for the group?

A) groups with a mix of prosocial and egoistic members B) groups with all prosocial members C) groups with all egoistic members D) groups with predominantly prosocial members and a few egoistic members