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External and Internal Validity Characteristics

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The proposed research is an examination of behavioral interventions (visual schedules) to improve social skills of preschool aged children with autism. Based on this research problem, it becomes evident that the population will need to be purposively selected which entails utilizing a non-random sampling method.

In terms of the impact of the sampling method on reliability and validity, it is evident that purposive or non-random sampling will limit the ability of the researcher to generalize the findings of the study to the larger population of preschool aged children. Non-random samples are not truly representative and therefore impact outcomes with regard to generalizability. Even though these issues exist, the plan for the research would be to minimize the negative impact of using a non-representative sample by randomly assigning children identified for the study to an experimental (visual schedule) group or control (no visual schedule) group. I am not sure but I think a random assignment of the purposive sample will help address problems with generalizability.

1). Briefly describe how random assignment method of sampling impacts the external and internal validity of this proposed study.

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The random assignment method of sampling will positively impact the external validity of this study, due to the fact that the sampling is ...

Solution Summary

This solution discusses the important features associated with external and internal validity.

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Research and Design

A pro-life group wanted to test the effectiveness of an antiabortion commercial. Two random samples, each of 250 respondents, were recruited in Atlanta, Georgia. One group was shown the antiabortion commercial. Then, attitudes toward abortion were measured for respondents in both groups.

What were the independent and dependent variables in this experiment?

What type of research design was used?

What are the potential threats to internal and external validity in this experiment?

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