  In this article the rotational invariance of entangled quantum states is
investigated as a possible cause of the Pauli exclusion principle. First, it is
shown that a certain class of rotationally invariant states can only occur in
pairs. This is referred to as the coupling principle. This in turn suggests a
natural classification of quantum systems into those containing coupled states
and those that do not. Surprisingly, it would seem that Fermi-Dirac statistics
follows as a consequence of this coupling while the Bose-Einstein follows by
breaking it. In section 5, the above approach is related to Pauli's original
spin-statistics theorem and finally in the last two sections, a theoretical
justification, based on Clebsch-Gordan coefficients and the experimental
evidence respectively, is presented.
