One thing to note here is it is plausible that your errors are not symmetric in expectation, if there’s some bias towards phrasing questions one way or another (this could be something like frequently asking “will [event] happen” where optimism might cause you to be too high in general, for example). This might mean assuming linearity could be wrong.
This is probably easier for you to tell since you can see the underlying data.
One thing to note here is it is plausible that your errors are not symmetric in expectation, if there’s some bias towards phrasing questions one way or another (this could be something like frequently asking “will [event] happen” where optimism might cause you to be too high in general, for example). This might mean assuming linearity could be wrong.
This is probably easier for you to tell since you can see the underlying data.