Question

after the massive 1989 loma prieta earthquake in san francisco, a research team studied its effects on the nightmares of three groups of college students: two groups from the bay area who had directly experienced the earthquake and a control group from arizona who had not. what type of design does this study use?

Answer 1

A control group from Arizona did not experience the earthquake, but two groups from the Bay Area did. This study used a non-equivalent group design.

A non-equivalent group design is one in which the researcher has no control over how participants are divided into groups. Internal validity may be seriously threatened if group assignment is not managed.

A between-subjects design in which participants have not been randomly assigned to conditions is called a nonequivalent group design. Take the example of a researcher who wants to evaluate the success of a novel method for teaching fractions to third graders.

The nonequivalent control group approach is useful for studying populations that already contain certain groupings. At the level of the intervention, randomization happens. Random assignments place study groups in either the treatment or the control group.

To learn more about non-equivalent group design

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