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 : 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.
Answer to relevant QuestionsThe article “Impacts of On-Campus and Off- Campus Work on First-Year Cognitive Outcomes” (Journal of College Student Development : 364– 370) reported on a study in which y = spring math comprehension score was ...This exercise requires the use of a computer package. The authors of the article “Absolute Versus per Unit Body Length Speed of Prey as an Estimator of Vulnerability to Predation” (Animal Behaviour : 347– 352) ...Use the data given in Exercise 14.29 to verify that the true regression function The article “Pulp Brightness Reversion: Influence of Residual Lignin on the Brightness Reversion of Bleached Sulfite and Kraft Pulps” (TAPPI : 653–662) proposed a quadratic regression model to describe the ...The paper referenced in Exercise 15.5 described an experiment to determine if restrictive age labeling on video games increased the attractiveness of the game for boys age 12 to 13. In that exercise, the null hypothesis of ...
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