The ability of ecologists to identify regions of greatest species richness could have an impact on the preservation of genetic diversity, a major objective of the World Conservation Strategy. The article “Prediction of Rarities from Habitat Variables: Coastal Plain Plants on Nova Scotian Lakeshores” (Ecology [1992]: 1852– 1859) used a sample of n = 37 lakes to obtain the estimated regression equation
where y = species richness, x1 = watershed area, x2 _ shore width, x3 = drainage (%), x4 = water color (total color units), x5 = sand (%), and x6 = alkalinity. The coefficient of multiple determination was reported as R2 = .83. Use a test with significance level .01 to decide whether the chosen model is useful.

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