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in the upland sagebrush habitat if the species were distributed randanly. • <br />ComRSSely, if 908 of all Percmyscus maniculatus (deer arouse) captures <br />occurred in the upland sagebrush type, this would indicate a definite <br />affinity of P. m3niculatus for the upland sagebrush vegetation type. <br />The Chi-square test (Snedewr and Cochran, 1967) was used to detPSntine if <br />the differences between the observed number of captures for a given species <br />in a given vegetation type and the rnm~ber of captures expected on the basis <br />of a random distribution were significant. The Chi-square statistic, Xz <br />is given by: <br />2 (Oi - Ei) 2 <br />X = E <br />E. <br />1 <br />where: <br />Oi = observed number of captures (or encounters) for habitat i <br />Ei = expected number of captures in habitat i based on random • <br />distribution atrong habitats <br />The calculated Chi-square value was catgx-ired to aChi-Square table to <br />determine if a significant difference between observed and expected number <br />of captures occurred at the 958 confidence level. If a significant <br />difference did exist, individual Chi-square values for individual habitats <br />were examined to provide an indication of those habitats for which a species <br />shows an affinity or an awidance. <br />• <br />-18- <br />