Finding and interpreting measures comparing proportions:

a. An observational study19 of patients hospitalized for gunshot wounds in the US between 2004 and 2013 classified the intent of the gunshot using categories

(assault, unintentional, suicide, undetermined, law enforcement, terrorism), with counts (179,793, 65,502, 24,624, 17,401, 5266, 10). Compare proportions for the categories unintentional and terrorism by a difference and by a ratio. Interpret.

b. According to a 2015 study by the Pew Research Center (www.peoplepress.org), the percentage of Americans who favor allowing gays and lesbians to marry legally was 81% for Democrats who identified themselves as liberal and 22% for Republicans who identified themselves as conservative. Identify the two variables and find the odds ratio between them.