Bob is an assembly line worker and knows his foreman always checks his work at 10:00 a.m. and 2:00 p.m. Consequently, he only works hard from 9:30 to 10:00 a.m. and from 1:30 to 2:00 p.m. He is on what kind of reinforcement schedule?

During a study, the experimenter tells Kerri, "Either the swan is black or it is not black." Even though Kerri has never seen a black swan, she judges this statement to be true. This is because Kerri

A) cannot yet conserve. B) is making an A-not-B error. C) is engaging in propositional thought. D) is egocentric.

A brief lowering and then increasing of a woman's basal body temperature occurs during which phase of the menstrual cycle?

A) The proliferative phase B) The menstrual phase C) The ovulatory phase D) The secretory phase