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?
Answer to relevant QuestionsIn the paper "Outcomes at School Age After Postnatal Dexamethasone Therapy for Lung Disease of Prematurity" (New England Journal of Medicine, Vol. 350, No. 13, pp. 1304-1313), T. Yeh et al. studied the outcomes at school age ...Refer to Exercise 10.43 and determine a 95% confidence interval for the difference between the mean number of native species in the two regions. The formula for the pooled variance, s2p, is given on page 397. Show that, if the sample sizes, n1 and n2, are equal, then s2p is the mean of s21 and s22. Suppose that you know that a variable is normally distributed on each of two populations. Further suppose that you want to perform a hypothesis test based on independent random samples to compare the two population means. In ...The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem. Essential to the growth of T. testudinum is ammonium. Researchers K. Lee and K. Dunton of the Marine Science Institute of the University ...
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