A Study Is Conducted to Test the Hypothesis That Cognitive

Multiple Choice

A study is conducted to test the hypothesis that cognitive behavioral therapy is more effective than eclectic therapy in alleviating the severity trauma symptoms among female victims of rape.Clients are assigned to one or the other of the foregoing two therapies based on which seems most appropriate for them in light of a thorough, reliable and valid clinical assessment.The severity of trauma symptoms is measured before and after treatment, using a valid and unbiased form of measurement.Which of the following statements is/are true about this study?

A) The design enables us to rule out plausible alternative explanations for differences in outcome between the two treatment groups.
B) It uses an experimental design.
C) Both a and b above are true.
D) It is a quasi-experiment that is vulnerable to a selectivity bias.