Psychological variables in people-examples: Type A & Type B personality, measure of
hostility, measure of compassion, introverted & extroverted, measure of intelligence, how
risk-taking people are, obedience to authority.
One way to research variables is to hold them constant, randomly assign, and account for
them in a statistical sense.
Random assignment you achieve and trust that groups can be equivalent. You are unlikely
to get unrepresentative results.
o You control variables by randomly assigning them.
Correlation method: measure already existing variables.
Relationship between self-esteem and promiscuity. Perhaps people with
greater self-esteem are less promiscuous.
Relationship between alcohol consumption and concussions. (3 variable
involved may be: risk-taking. Perhaps reckless people have more concussions
and more adventurous people consume more alcohol).
Relationship between drowning and eating ice-cream. In summer, people eat
more ice cream, they also swim which can lead to drowning. It doesn’t mean