I would be more likely to believe the results if they tested these adults and not asked them.

There's a big ego hit in admitting you don't know something. And many people are brought up thinking that it's a shame not to know something and that someone is better for knowing something. Like, a better person, not just better in some field.

And then the second question was: “How often would you base decisions on reported statistics if you understood it better?”

Talk about a leading question. I get that they were tacking on their “study” to a larger question pool, but they could have put more effort in to the questions or done some actual testing.