laboratory experiment - an experiment with high levels of control over the environment and extraneous variables, researcher can establish cause-and-effect relationships., field experiment - an experiment taking place in an everyday setting, natural experiment - the researcher observes IV's and DV's occuring naturally in society, it's not a true experiment because there is no manipulated IV, observation - the researcher watches participants behaviour to collect data, correlation - trying to find a relationship between two co-variables, case study - a detailed study of one individual, family or institution, matched pairs design - an experimental design where similar participants are grouped together and divided equally between groups, independent measures design - different participants are used in each level of the IV, repeated measures design - the same participants are used in each level of the IV, interview - when researcher asks participants questions and they answer verbally, over the phone or face-to-face, questionnaire - participants answer written questions, can be on paper on on a computer,

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