16.1 Suppose there are two normal populations that are each two-dimensional with unknown parameters. We want to classify an observation z. Suppose the training samples give x = (2,3)' S = x = (3,1)' == 3 (14) S = (22) based upon N = N = 10 observations. Let the observed vector be given by z = (2.1.5)'. If the prior odds are equal, classify z into one of the two populations.