Answered: A researcher found out that some coal…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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Question

A researcher found out that some coal miners in a community of 960 miners had anthracosis. He would like to find out what was the contributing factor for this disease. He randomly selected 500 men (controls) in that community and gave them a questionnaire to determine if they too had anthracosis. One hundred-fifty (150) of them reported that they mined coal, but did not have anthracosis. From those who had the disease, 140 were not coal miners. Calculate the measure of association between exposure to coal dust and development of anthracosis.

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