Test theory suggests that concurrent validity coefficients underestimate population validity. What does research suggest?

a) Concurrent validity coefficients do, in fact, underestimate population validity.
b) Concurrent validity coefficients are often similar in size to predictive validities

Suppose that laboratory animals are taught that a tone predicts food delivery. Then, a light is added as a second CS and they are given additional trials paired with food. If the animals now are tested with the light alone, they will

a. salivate more to the light than when it was presented with the tone. b. salivate equally to the light as they did to the tone. c. salivate to the light, but less quickly than they did to the tone. d. not salivate to the light.

Al must build 25 radios before he receives $20 . What schedule of reinforcement is being used?

a. a variable-ratio schedule b. a fixed-ratio schedule c. a fixed-interval schedule d. a continuous schedule e. a fixed at contiguous schedule