the middle score in a distribution; half the scores are above it and half are below it

A research method in which an investigator manipulates one or more factors (independent variables) to observe the effects on some behavior or mental process (the dependent variable).

Type of information processing that involves attending to the conent of the message itself (type of persuasion)

refers to the tendency for a group to make decisions that are more extreme than the initial inclination of its members.

A sample that fairly represents a population because each member has an equal chance of inclusion

occurs when an individual acts in a less positive way or performs worse when they are around others

A psychological perspective that focused on human potential and achievements

Type of psychological perspective in which the reason human beings behave the way they behave is due to past experiences(traumatic) -studied by Sigmund Freud

the phenomenon when the behavior of the participants will be changed because of being in an experiment

a descriptive technique of observing and recording behavior in naturally occurring situations without trying to manipulate and control the situation

A measure of the extent to which two factors vary together, and thus of how well either factor predicts the other. The correlation coefficient is the mathematical expression of the relationship, ranging from -1 to +1j

Assigning participants to experimental and control conditions by chance ,thus minimizing preexisting differences between those assigned to the different groups