In the article "Floral Diversity in Relation to Playa Wetland Area and Watershed Disturbance" (Conservation Biology, Vol. 16, Issue 4, pp. 964-974), L. Smith and D. haukos examined the relationship of species richness and diversity to playa area and watershed disturbance. Independent random samples of 126 playa with cropland and 98 playa with grassland in the Southern Great Plains yielded the following summary statistics for the number of native species.

At the 5% significance level, do the data provide sufficient evidence to conclude that a difference exists in the mean number of native species in the two regions?

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Cropland Wetland i 14.06 I5.36 24.95 n2 = 98