HW2 - BME-423 HOMEWORK #2 FALL 2008 1. The table below is...

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BME-423 HOMEWORK #2 FALL 2008 1. The table below is taken from a study investigating the cause of diarrhea in patients with gastroenteritis and shows the relationship between foreign travel and a positive result for the organism Providencia alcalifaciens (Haynes and Hawkey 1989) P. alcalifaciens Recent travel abroad? Positive Negative Yes 25 229 No 5 368 Is there a statistically significant association between traveling abroad and being positive for P. alcalifaciens among people with gastroenteritis? (use χ 2 test to answer this question) 2. Answer the question posed in #1 by doing the z statistic (with Yates correction). 3. In a study of patients admitted to an otolaryngology ward, 140 patients with nose-bleeds were compared to 113 controls with other conditions. Patients were interviewed about their alcohol consumption (McGarry et al., 1994). The results were: Alcohol consumption Nose-bleed patients Other patients Non-drinkers 47 39 Occasional drinkers 30 40 Regular drinkers 63 34 Do these results suggest any relationship between alcohol consumption and nose-bleeding? If a
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This note was uploaded on 12/02/2008 for the course BME 423 taught by Professor D'argenio during the Fall '06 term at USC.

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HW2 - BME-423 HOMEWORK #2 FALL 2008 1. The table below is...

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