List three reasons why a study may be considered invalid.

Answer:

Responses may vary but should include some or all of the following information: The test questions used as a measurement in the study could be poorly designed or misinterpreted, the sample selection may not accurately represent the population, the researcher may have insufficient data to support the research claim, there may be interference in the results of the study from unrecognized variables, the scores may not accurately represent the theory about the subject, the test questions may be unrelated to the subject, or the test used may fail to predict a specific outcome that it is designed to measure.