Prescott's Microbiology
Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 36.3, Problem 3CC
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The epidemic can be a common source epidemic and propagated epidemic. Majority of the epidemic caused by the propagated epidemic, where a single infected person is a major reason for spreading an infection to all the susceptible individuals in the population. Yet, the spread of infections can be prevented by vaccination.   

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Q8. A researcher wants to study the effectiveness of a pill intended to reduce stomach heartburn in pregnant women. The researcher chooses randomly 400 women to participate in this experiment for 9 months of their pregnancy period. They all need to have the same diet. The researcher designs two groups of 200 participants: One group take the real medication intended to reduce heartburn, while the other group take placebo medication. In this study what are: Independent variable: Dependent variable: Control variable: Experimental group: " Control group: If the participants do not know who is consuming the real pills and who is consuming the sugar pills. This study is It happens that 40% of the participants do not find the treatment helpful and drop out after 6 months. The researcher throws out the data from subjects that drop out. What type of bias is there in this study? If the company who makes the medication funds this research, what type of bias might exist in this research work?
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Epidemiological Studies - made easy!; Author: Let's Learn Public Health;https://www.youtube.com/watch?v=Jd3gFT0-C4s;License: Standard Youtube License