Psychological Methods

3. A controlled scientific procedure to determine whether certain variables manipulated by the researcher have an effect on other variables.
4. A measure of the distance of every score to the mean.
6. The concept that people who volunteer to participate in research studies often differ from those who do not volunteer.
7. The total group to be studied or described and from whom samples may be drawn.
8. The study of behavior in naturally occurring situations without manipulation or control on the part of the observer.
10. An experiment that uses both a control group and an experimental group to determine whether the independent variable influences on behavior and, if so, how it does so.
12. A type of research in which the same people are studied over a long time period.
14. A relationship between variables in which one variable increases as the other variable also increases.
16. In a study, the participants who received the treatment.
19. A method of research that looks at different age groups at the same time in order to understand changes that occur during the life span.
20. Factors that are measured or controlled in a scientific study.
21. The factor that is manipulated by the researcher to determine its effect on another variable.
22. An in-depth study of a single person or group to reveal some universal principle.
23. In an experiment, the factor that is being measured and that may change in response to manipulations of the independent variable.

1. An agreement by an individual to participate in research after receiving information about the purpose of the study and the nature of the treatment.
2. In an experiment, the group that does not receive the treatment.
4. A study in which the participants are unaware of whether they are in the control group or the experimental group.
5. An experiment in which neither the participant nor the researcher knows whether the participant has received the treatment or the placebo.
9. The study of behavior in a controlled situation.
11. An inert substance used in controlled experiments to test the effectiveness of another substance.
13. The relationship between variables.
15. A prediction or assumption about behavior that is tested through scientific research.
17. Rules and standards for proper and responsible behavior.
18. correlation An unpleasant stimulus between two variables in which one variable increases as the other variable decreases.