I forget where I stole this from, but I like it:<p>Imagine that you have a coin, and you are told that it is not fair (asymmetrical mass distribution). But you are not told in which direction it is biased. If you flip it, what are the chances that it comes up heads?<p>A Bayesian would say the p(heads) = 1&#x2F;2.<p>A frequentist would say that the only thing we can say about the p(heads) is that p(heads) ≠ 1&#x2F;2.