Is Not Saying "I Don't Know" a Guy Thing?

Our most recent podcast, “Why Is ‘I Don’t Know’ So Hard to Say?,” continues to draw interesting replies. Here’s one from Erich Knobil, who works in the finance office of the Falls Baptist Church & Academy in Menomonee Falls, Wisc.:

A couple of minor notes about “I don’t know” —

Someone (a consultant) once told me the “Consultant’s Motto” was “Maybe wrong, but never in doubt.”

Someone else (female) once called it “Male Answer Disorder (MAD),” where men seem compelled to always have an answer for everything.

Anyone know of any good empirical work on whether MAD is real?