COMM 101 Lecture Notes - Lecture 23: Ecological Validity, Random Assignment, Internal Validity

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Some dvs cannot be measured in a lab: example: Observe student behavior: in this example: Randomization happened in the eld (i. e. outside the lab) All other characteristics of an experiment were met. Some dvs cannot be measured in a lab. Some ivs cannot be manipulated by researchers: example: Being in poverty (vs. not) is being manipulated. The randomization procedure was not controlled by the researcher, and assignment was not perfectly random: when this happens, we call the result a quasi-experiment. Notes on eld, natural, and quasi-experiments: frequently combine experiments and observational data, field and natural experiments can sometimes be true experimental designs, all three sacri ce some internal validity for external validity. Take away #1: alternative experimental designs escape the constraints of the lab. Survey experiments: embed an experiment inside your survey: bene ts of surveys: Good external validity: bene ts of experiments:

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