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Experimental Research- one or more independent variables are manipulated…
Experimental Research- one or more independent variables are manipulated by the researcher randomly assigned treatments, the results and outcomes are observed
Internal validity - the unique strength of experimental research is it causality due to its ability to link cause and effect through treatment manipulation, while controlling for the spurious effect of extraneous variable
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Factorial designs - enable the researcher to examine not only the individual effect of each treatment on the dependent variables
Main effect - is said to exist if the dependent variable shows a significant difference between multiple levels of one factor
Interaction effect -exists when the effect of differences in one factor depends upon the level of a second factor
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Field experiments -conducted in the field settings such as in a real organization, high in both internal and external validity
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Random selection and assignment -is the process of randomly drawing a sample form a population or a sampling frame
Treats to internal validity - include history, maturation, testing, instrumentation, mortality, and regression.
Pretest-posttest control group design - subjects are randomly assigned to treatment and control groups
Posttest-only control group design - a simpler version of the pretest-posttest design where pretest measurements are omitted
Covariance designs - measures of the depend of dependent variables that can be influenced by extraneous variables
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