> Introducing a slight bias factor that is randomized each time results in a lower average bias compared to a bias factor that is the same every time. That's w

> Introducing a slight bias factor that is randomized each time results in a lower average bias compared to a bias factor that is the same every time. That's what I'm saying—it's reasonable to believe that the submission time is correlated with other factors, such as ability or confidence (though the effect can cut both ways, with extremely able students submitting early because they finish early or late because they are extra careful, and similarly for other factors). Thus, this isn't really randomization, just correlation with another factor than the name.