I certainly hope the next survey will ask how many of those saying they agree or disagree with it

Since our certainty was given as a percentage, none of us said we agreed or disagreed with it in the survey, unless you define "agree" as certainty > 50% and "disagree" as certainty below 50%

Or are you saying that we should default to 50%, in all cases we aren't scientifically qualified to answer of our own strength? That has obvious problems.

"So ask the question next survey. I do, however, strongly suspect they're expressing an opinion on something they don't actually understand"

That's like asking people to explain how consciousness works before they express their belief in the existence of brains, or their disbelief in the existence of ghosts.