RES 440 Week 6 Strategic Plan Assignment_Instructions 1 Assignment: Strategic

A research study examines whether borderline personality disorder and bipolar disorders are on the same spectrum or if they are distinct disorders. A major concern of the researchers was that bipolar II disorder, in particular, was being overdiagnosed as being comorbid with borderline personality disorder, which then resulted in the false impression that they were on the same spectrum. The investigators highlighted the important treatment implications in distinguishing between bipolarity (which responds well to pharmacological interventions) and borderline personality disorder (which responds best to psychotherapy approaches). Although they found 10 to 20% comorbidity between the two diagnoses, the vast majority of patients had either a bipolar disorder or a borderline personality disorder but not both disorders. Based on this finding, the researchers concluded that bipolar disorders and borderline personality disorders are categorically different disorders rather than being on the same spectrum or dimension. Which of the following factors would cast the most doubt on the internal validity of their findings? Absence of independent variable Convenience sample Lack of random assignment Poor intra-rater reliability

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