1. An important distribution that is used to describe 2by-2 contingency tables with both row and column sums xed is the non-central hypergeometric distribution. One interpretation is that we have a population of 8 items out of which 51 have some attribute A, and we want to sample m1 items and leave m2 = .3 ml in the population. Let us assume that the sample and population are large enough so that 81