The fact that infant Ricardo has come to expect that his mother is available when he needs her means that Ricardo has developed

a. temperament

Using a nonrandom sample will always produce better external validity than using a census or random sample

Answer the following statement(s) true (T) or false (F)

When the number of responses is important to a schedule of reinforcement, that schedule is called a __________ schedule

a) ratio b) interval c) conditioned d) time-delayed