External Validity - Is the Thesis

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b) Preexperimental design and quasi-experimental design- a Preexperimental design is a design that acts as a blueprint for the actual research and a quasi-experimental design is a design that resembles a quantitative or qualitative research design but lacks controls.

c) history and maturation -- history refers to events that take place outside of the experiment that may affect participants' responses to the experiment and maturation refers to the change that occurs during the course of an experiment.

d) random sampling, randomization, and matching - random sampling refers to the choosing subjects to participate in an experiment on a purely random basis in which all subjects have the same chance of being selected.

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Randomization is the process of making something random and matching is the reduction of bias when analyzing data.

e) environmental variables and extraneous variables -- environmental variables are variable that exist in the environment that can have an effect on the subject while extraneous variables are variables other than the independent variable that may have an effect on….....

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