Question

Researchers conducted a randomized, double-blind study to measure the effects of the drug olanzapine on patients diagnosed with bipolar disorder. A total of 115 patients with a DSM-IV diagnosis of bipolar disorder were randomly divided
into two groups. Group 1 (n1 = 55) received 5 to 20 mg per day of olanzapine, while group 2 (n2 = 60) received a placebo. The effectiveness of the drug was measured using the Young–Mania rating scale total score with the net improvement in the score recorded. The results are presented in the table. Does the evidence suggest that the experimental group experienced a larger mean improvement than the control group at the a = 0.01 level of significance?


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  • CreatedApril 28, 2015
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