Context: I’m always told on big tests that if I run out of time I should bubble all A’s or something because it’s a better chance I get it right than if I sporadically bubble answers. Why isn’t it just a consistent 25% chance?
In: 0
It is an even chance. But the variance is much lower. Most tests are intentionally written so that the answers get an evenly distribution of the choices. By picking the same answer for every question you know you are going to get a score of 25% given four choice for each question. But if you pick answers at random you might end up getting fewer correct answers by chance, or more correct answers.
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