Susan trained her rat to press a bar in a Skinner box in order to get a food pellet. Susan's rat pressed the bar a lot. However, later when Susan ran out of food pellets her rat eventually stopped pressing the bar. What had happened?

In Europe, young adults cannot drive until they are 18 years of age. What has been the consequence of increasing the minimum driving age?

What will be an ideal response?

A recent study by Dr. Fulani wanted to insure that each participant in the study had an equal

chance of being assigned to the experimental groups or the control group. Which of the following is the best method to assign participants? a. Systematically b. Their choice c. Researcher preference d. Randomly