10.43 Floral Diversity. In the article "Floral Diversity in Re- lation to Playa Wetland Area and Watershed Disturbance" (Con- servation Biology, Vol. 16, Issue 4, pp. 964-974), L. Smith and D. Haukos examined the relationship of species richness and di- versity to playa area and watershed disturbance. Independent ran- dom samples of 126 playa with cropland and 98 playa with grass- land in the Southern Great Plains yielded the following summary statistics for the number of native species. Cropland Wetland TI = 14.06 6 - 15.36 51 -4.83 1 - 4.95 11 = 126 12 - 98 At the 5% significance level. do the data provide sufficient evi- dence to conclude that a difference exists in the mean number of native species in the two regions