  I show that probabilities in quantum mechanics are a measure of belief in the
presence of human ignorance, just like all other probabilities. The Born
interpretation of the square of modulus of the wave function arises from the
interaction of a quantum system with an observer, and probabilities will not
arise unless the observer is unable to access all the information available in
the system's wave function. Quantum mechanics generally does not permit all the
information to be obtained, even in principle, just as in relativity
information from outside the past light cone cannot be obtained. But
probabilities do not imply indeterminism. Instead, quantum mechanics is more
deterministic than classical mechanics.
