In the 1930s, learning that is influenced by stimuli that follow the response was christened "operant conditioning" by

A startle reflex occurs in response to ____

a. grief b. depression c. anxiety d. an unexpected loud noise

An experiment is conducted to investigate the effects of three different doses of a drug (low, medium, high) on reaction time. The null hypothesis is that

a. The low dose leads to faster reaction times b. The high dose leads to faster reaction times c. There is no difference between the reaction times associated with the three doses d. There is a difference between the reaction times associated with the three doses