NPR has said that Vox Pop was the first "Quiz Show" but that was sort of peripheral to the show, which was produced in a different location each week.
It billed itself as the "premier audience participation show" and now these short interviews provide a keyhole glimpse into the era in which it was created.
You can read more about Vox Pop here:
http://www.npr.org/programs/morning/features/patc/quizshow/index.html