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  1. theoretical entities, or concepts, that enable
    one to discuss something that cannot be seen, touched, or measured directly
    psychological constructs
  2. a prediction or assumption about behavior that
    is tested through scientific research
  3. to repeat a research study, usually with different
    participants and in different situations, to confirm results of an original
  4. a research technique for acquiring data about
    the attitudes or behaviors of a group of people, usually by asking questions of
    a representative, random sample
  5. the total group to be studied or described and from whom samples may be drawn
    target population
  6. a representative segment of a target population
  7. a survey population, selected by chance, which
    fairly represents the general population
    random sample
  8. a sample drawn in such a way that known
    subgroups within a population are represented in proportion to their numbers in
    the general population
    stratified sample
  9. the concept that people who volunteer to
    participate in research studies often differ from those who do no volunteer 
    volunteer bias
  10. an in-depth study of a single person or group to reveal some universal principle
    case study
  11. a type of research in which the same people are
    studied over a long period of time
    longitudinal method
  12. a method of research that looks at different age
    group at the same time in order to understand changed that occur during the
    life span
    cross-sectional method
  13. the study of behavior in naturally occurring
    situations without manipulation or control on the part of the observer
    naturalistic observation
  14. the study of behavior in a controlled situation
    laboratory observation
  15. the relationships between variables
  16. a relationship between variables in which one
    variable increases as the other variable also increases
    positive correlation
  17. an unpleasant stimulus between two variables in
    which one variable increases as the other variable decreases
    negative correlation
  18. a controlled scientific procedure to determine whether certain variables manipulated by the researcher have an effect on other variables
  19. factors that are measured or controlled in a scientific study
  20. in an experiment, the factor that is being measured and that may change in response to manipulations of the independent variables
    dependent variable
  21. the factor that is manipulated by the researcher to determine its effect on another variable
    independent variable
  22. in a study, the participants who receive treatments
    experimental group
  23. in an experiment, the group that does NOT receive the treatment
    control group
  24. an experiment that uses both a control group and experimental group to determine whether the independent variable influences behavior, and if so, how does it
    controlled experiment
  25. placebo
    an inert substance used in controlled experiments to test the effectiveness of another substance
  26. a study in which the participants are unaware  of whether they are in the control group or experimental group
    single-blind study
  27. an experiment in which neither the participant nor the researcher knows whether the participant has received treatment of placebo 
    double-blind study
  28. a measure of the distance of every score to the mean
    standard deviation
  29. rules and standards for proper and responsible behavio
  30. an agreement by an individual to participate in research after receiving information about the purpose of the study and the nature of the treatment 
    informed consent
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