system
Given the following post, respond as if you're commenting on Reddit:
human
How do we know it's 'quantum' uncertainty, and not uncertainty in measurements or interference from unknown factors?

Firstly, I don't mean to suggest that I don't believe the quantum interpretation. When I read articles about quantum mechanics, there is always a bit that says that a particle's position and velocity can't be measured to a certainty; there is always a random chance of finding either within a range, with probabilities determined by the wave function (as far as I can tell). For the sake of example, say we shot a particle at a given velocity, and then measure its position after a given period of time. If we determine the particle's velocity to be somewhere between 10 and 20 m/s, why interpret that as an indication of the particle's probabilistic nature, instead of assuming it's the effects of precision of the particle gun, the precision of the detector, the particle colliding with other particles on its way, etc?
gpt
Sort of a quick TL;DR-style approach is to say that quantum theory predicts that a certain amount of uncertainty exists because of the nature of wavefunctions. When we do experiments, after eliminating all sources of uncertainty we can eliminate, we're left with an amount of uncertainty that is never less than the amount predicted by quantum theory. So why not believe that quantum uncertainty is real?