Describe each of the following types of designs explain its, Ask an Expert

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1) Explain and give examples of how the particular outcomes of a study can suggest if a particular threat is likely to have been present.

2) Describe each of the following types of designs, explain its logic, and why the design does or does not address the selection threats of Trochim and Donnelly (2006):

a. Non-equivalent control group pretest only
b. Non-equivalent control group pretest/posttest
c. Cross-sectional
d. Regression-Discontinuity

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