HW2 - BME-423 HOMEWORK #2 FALL 2006 1. Narrowing of the...

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BME-423 HOMEWORK #2 FALL 2006 1. Narrowing of the carotid arteries can reduce flow to the brain and starve the brain of oxygen, a condition called cerebral ischemia. To study whether medical (i.e., drug therapy) or surgical treatment of this problem produced better results, an investigation was conducted in which the outcome (defined below) was determined in patients who received medical or surgical treatment. Therapy Recurrent ischemia, stroke, or death (# of patients) YES NO Surgical 55 41 Medical 49 15 Is there sufficient evidence to conclude that one treatment is better than the other? To answer this question use the z statistic (with Yates correction) for testing the difference of sample proportions. 2. Answer the question posed in #1 by doing the χ 2 test. 3. A study of 96 women was conducted to determine if there is a relationship between the status of human papilloma virus (two HPV outcomes: positive or negative) and the stage of human immunodeficiency virus (HIV) infection (three possible stages of HIV: HIV negative, HIV
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HW2 - BME-423 HOMEWORK #2 FALL 2006 1. Narrowing of the...

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