^ The link I posted above for the Brady site was to the Home page only. The page on which the data for gun-control laws are listed is http://www.bradycampaign.org/stategunlaws/ The data by State on this site-page are used as the indendent veriable (x). EDIT: I can't link to the data page. On the link here you must then click on the "State" arrow, then click on the download State data button. Geeeeesh, they didn't make this easy, though it seemed easy when I first found it.
The data for gun-murder rate per-100,000 population shown on the other site is at (http://www.guardian.co.uk/news/datablog/2011/jan/10/gun-crime-us-state) as noted in my first post, and were used as the dependent variable 
in the analysis.
Since I'm having trouble posting the entire database I used, I'll provide several examples here to further explain the methodology.
California has the highest gun-control rating listed on the Brady site, that being a rating of 81. This number was listed as an independent variable (x) in the analysis. Data from the Guardian site listed California's gun-murder rate as 3.25 gun murders per-100,000 population. This number was used as California's corresponding dependent variable . New Jersey had the second highest rating for gun-control at 72 on the Brady site, with a gun-murder rate of 3.07 per-100,000 taken from the Guardian site. Utah was rated on the Brady site as 0 for the strictness of its gun-control laws, with a corresponding gun-murder rate from the Guardian site of .97 per-100,000 population. The balance of the States were handled in the same manner.
Gun-Control data was available for all 50 States on the Brady site. However, gun-murder rates were not available for Florida nor Alabama on the Guardian site. The analysis did not include those two States because of those missing "y" variables, thus 48 States constituted the database. If you click the link to each site, you'll find the data for each variable as noted "x" and "y".
