"Twenty dogs are initially presented with numerous CS-tone/US-footshock pairings. These dogs are then placed in a shuttle box, and movement from one side of the shuttle to the other terminates periodic presentations of the CS tone. No shocks are delivered in the shuttle box, but the dogs learn to move to the other side of the box to escape the tone. This is an example of "

An escape from fear procedure.

Explanation:

Escape from fear (EFF) is a phenomenon involving animals learning to perform an escape of a fear-eliciting conditioned stimulus (CS) in a situation where the escape response is paired with CS termination.

Escape from fear procedure however, comprises of traditionally condition a fear response, then the subjects are allowed to perform an instrumental response to avoid the Condition Stimulus-- This is mainly confirm predictions of two-process theory.

Hence, in this case, this is an example of an ESCAPE FROM FEAR PROCEDURE.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !