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Noroviruses Cause Roughly 21 Million Cases of Gastroenteritis ("Stomach Flu")

Question 17

Multiple Choice

Noroviruses cause roughly 21 million cases of gastroenteritis ("stomach flu") annually in the United States. A study examined the effectiveness of a new norovirus vaccine. Healthy adult volunteers received, at random, either the vaccine or a placebo. They were then exposed to the norovirus. In all, 14 of the 38 vaccinated subjects suffered from gastroenteritis compared with 27 of the 39 subjects who received a placebo. We want to know if this study provides evidence that an outcome of gastroenteritis depends on the treatment received. What is the proportion of individuals suffering gastroenteritis in the entire study?


A) 0.368
B) 0.500
C) 0.532
D) 0.692

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