What are the most important threats to validity

Reference no: EM131322010

1. What are the most important threats to validity that occur in quasi experimental research designs when the research is conducted over a period of time? What techniques can be used to minimize these potential interpretive problems?

2. What is regression to the mean, and why is it a threat to the validity of research designs in which random assignment has not been used?

Reference no: EM131322010

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