I would be careful with trusting the answers to those questions.
People remember things to be more positive than they were. This is an established bias in human psychology
People remember things to be more positive than they were. This is an established bias in human psychology
I read your response as “okay then, if we can’t ask that question, we have to spy” etc. which I think did not follow from my post - I misunderstood you, thanks for clarifying.
2) Asking more people gives you an answer closer to the ‘truth’ (i.e. the true population mean; the mean answer if you asked ‘everyone’). It lowers sample error, not directional bias.