• Complete a chi-square test of independence
• Write the conclusion of a chi-square test of independence in context of the problem

Alcoholism Risk in 9/11 Responders

Some firefighters and other first responders to the World Trade Center on September 11, 2001, have experienced symptoms of traumatic stress, depression, anxiety, and drinking problems. Cornell University researchers conducted a survey of a random sample of New York firefighters, some of whom had participated in the 9/11 rescue efforts. The report’s title is “On the Front Line: The Work of First Responders in a Post-9/11 World.” You can see the full report here.

We use data from this report to investigate the question: Are alcohol-related problems among New York firefighters associated with participation in the 9/11 rescue?

Here are the data from the report:

	No risk for alcohol problems	Moderate to severe risk for alcohol problems	Total
Participated in 9/11 rescue	793	309	1102
Did not participate in 9/11 rescue	441	110	551
Total	1234	419	1653

Let’s use the statistical tool to conduct the Chi-Squared test of Independence.
Remember to select “Contingency Table” under Enter Data and input our values accordingly.

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