Withdrawal is one of the most common and effective ways of dealing directly with conflict or frustration

In Pavlov's classical conditioning experiment, he presented the sound of a bell along with meat powder to his dogs. After several trials, the dogs learned to salivate to the sound of the bell in the absence of the meat powder. When the dogs salivated only at the sound of the bell and in the absence of meat powder, salivation acted as a(n) ________.

A. conditioned stimulus (CS) B. conditioned response (CR) C. unconditioned stimulus (UCS) D. unconditioned response (UCR)

The pooled variance is the ______.

A. combined and weighted variances of the two groups in a simple experiment B. average variance of the two groups in a simple experiment C. sum of the two variances of the two groups in a simple experiment D. unweighted variances of the two groups in a simple experiment