Why is it important to give exact operational definitions of variables?
Two experiments testing the same hypothesis that measure variables differently may have different conclusions.
Which 3 research goals can be satisfied by correlational research?
Predictions, assess external validity of experimental findings, we can study phenomenons that we cannot study in an experiment.
Which goal can non be satisfied by correlational research?
cause and effect because correlation does not establish causation
How do we know if a placebo effect is working in an experiment or not?
If both the experimental and control group show a smilier change even though we didn't give any amount of the independent variable to the control group.
What are the purposes of replications?
Two reasons: to determine whether a sample we studied is truly representative of the population of interest and to examine external validity.
Why would we use double-blind experiments?
Design minimizes participants placebo effect and experimenter expectancy effect.
Why is it that the samples we take are representative?
If the samples aren't representative, it is likely that the conclusion made isn't valid.