Study designs and validity threats

Reference no: EM1394367

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,

a. Non-equivalent control group pretest only

b. Non-equivalent control group pretest/posttest

c. Cross-sectional

Reference no: EM1394367

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