Another Example PDF
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ESCP Business School
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Summary
This document details a study analyzing the relationship between Hepatitis C and tattoo origin among 626 American medical center attendees. It includes conditional percentage comparisons of individuals with no tattoo having Hepatitis C, individuals with Hepatitis C having no tattoo, and individuals with no tattoo and Hepatitis C. The variables are found to be not independent.
Full Transcript
Another Example The data below comes from a study of 626 people attending a particular American medical centre. The study looked at where people had their tattoo and whether they have Hepatitis C. 16 Conditional percentages: perce...
Another Example The data below comes from a study of 626 people attending a particular American medical centre. The study looked at where people had their tattoo and whether they have Hepatitis C. 16 Conditional percentages: percent of what? Compare: 1. What percent of individuals with no tattoo have Hep C? The clue is in the 2. What percent of individuals with underlined phrase... Hep C have no tattoo? Always look for what 3. What percent (?) have no tattoo follows the “of”... and do have Hep C? If there is no “of” then implicitly it is “what percent of everyone” 17 Are Hepatitis C and Tattoo Origin independent? How did we obtain the below table? Let’s compare conditional distributions shown in columns: About 33 % of people with tattoos from a commercial parlor have Hep C; only 3.5% of people with no tattoo have Hep C. The % of people with Hepatitis C varies across the categories of Tattoo origin. Þ the variables are clearly not independent! 18
