These people are turning to their fellow poo-flinging monkeys, who are all about as jacked up as a soup sandwich, instead of, oh, I dunno, GOING TO GOOGLE?
Seriously?
DUmmies--lemme help you out here. 500 degree oven. 5 minutes/lb for medium rare, 6 min/lb for medium, and 7 min/lb for med-well (God only knows why, but there it is.) Stick the roast in, bone side down/fat side up, liberally salted/peppered, maybe a few sprigs of rosemary, AND THAT'S IT. Leave it there for the time calculated; i.e., 8 lb roast medium rare should be 40 minutes. At that point, turn the oven off and DON'T TOUCH A DAMNED THING for two hours. Should come out perfectly medium rare at 130-135 degrees. Let it rest for 20 minutes. You can use a meat thermometer as a backup but you really don't need it.
So simple even you retards couldn't screw it up, although I'm sure you'd find a way somehow.