In order for a study to be considered experimental, the researcher must manipulate a variable

Duke has a tendency to take credit when his team wins, but blame his teammates when the team loses. Duke's behavior is best explained as __________

a. self-serving bias b. self-gratification c. objective analysis d. self-monitoring

Which individual would you expect to have the most stable personality – that is, a person who shows consistent behavior over time?

a. ?a 5-year-old b. ?a 10-year-old c. ?a 15-year old d. ?a 30-year old