PSYB01H3 Chapter Notes - Chapter 8: Cerebral Cortex, Biculturalism, Longitudinal Study
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Usually, we cannot manipulate things like: gender; race; age; ethnicity etc. Natural treatment: independent variable where exposures to events, situations, or settings that emanate from the real world" define how participants are selected. Exposure and nonexposure would be the levels of this variable. Researchers can only provide ex post facto ( after-the-fact") analysis of the effects on a dependent variable. Quasiexperiment: resembles a true experiment except for the degree to which an experimenter can directly control and manipulate one or more of the independent variables. Whether the experimenter can randomly assign participants to experimental and control conditions (in this case, they can"t) Nonequivalent-control-group designs: have experimental and comparison groups that are designated before the treatment occurs and are not created by random assignment. Random assignment cannot be used to create groups. Confounds related to equivalency of groups (control vs. experimental) cannot be eliminated: often high in external validity, particularly ecological validity.
