Apparently he *did* say these:

My favorite Yogi Berra line: Asked if he thought whether Joe DiMaggio's marriage to Marilyn Monroe was good for baseball, he answered, "Well, I don't know if it's good for baseball, but it's gotta beat the hell out of rooming with Phil Rizzuto."

My Bronx-raised father's favorite Yogi Berra line: Berra was rooming with third baseman Bobby Brown, who was going through medical school at the time. (Fascinating man. Look him up.) One night, Brown was reading a medical textbook in bed and Berra was reading a comic book. Berra leaned over to Brown and said, "I hope yours is as good as mine!" (Different versions exist.)

Interestingly, neither is a Yogi-ism. So, alas, here is one: "It ain't over 'till it's over." And it is.