  We present an alternative approach to modeling Einstein-Podolsky-Rosen-Bohm
(EPRB)-type experiments. The basis for our approach will be to replace the
conventional Kolmogorov theory of probability, with the more general
Dempster-Schafer theory of evidence. This leads to the identification of a
distinct type of epistemic uncertainty, which is not present in Kolmogorov
theory, but which is relevant in modeling experiments with operationally
incompatible observables. Our treatment naturally yields conditional relative
frequencies, which are perfectly compatible with classical determinism and
locality, but which do not satisfy Bell-type inequalities.
