In a study reported in the July 2007 issue of the Journal of Epidemiology and Co

Question

In a study reported in the July 2007 issue of the Journal of Epidemiology and Community Health, researchers investigated whether veterans are more likely to commit suicide than nonveterans. They spent 12 years following 84,000 veterans who had served in the armed forces between 1917 and 1994, and compared them with 116,000 nonveterans. They found that 167 veterans and 211 nonveterans committed suicide.

1. Identify the explanatory and response variables in this study.

2. Is this an experiment or an observational study? Explain briefly.

3. Notice that more nonveterans than veterans committed suicide (211 vs. 167).

Would you conclude that veterans are less likely to commit suicide than nonveterans? Explain.

4. Calculate the relative risk of committing suicide, comparing veterans to nonveterans.

5. Describe and justify the conclusion that you would draw from this study.

Explanation / Answer

a)

explanatory variable : veterans and nonveterans

response variable : more likely to commit suicid

b) observational study

you are only observe the statistics of the report

c)

I conclude that verterns are less likely to commit suicide than nonveternas because the proportion of nonveterans

are greater than veterans commited suicide

4)

relative risk of commiting suicide veterans = 167 / 84000

relative risk of commiting suicide nonveterans = 211 / 116000

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