We are interested in comparing the odds that a squirrel is seen within 20 meters of a garbage can with the odds that a squirrel is seen beyond 20 m of a garbage can. Write out the model he might consider. Give null and alternative hypotheses and the rejection region for such a test. The data in birdskel.txt were sampled at random from a larger study by Prange et al. They reinvestigated the question of whether birds have proportionately lighter skeletons than mammals because of their adaptation for flight.
All weights are in kilograms.
Of interest to researchers is whether skeletal mass can be predicted from body mass, and whether this relationship is different for birds and mammals. Choose and report the model that best addresses the research question. Give confidence intervals for the slopes for birds and for mammals. Give a confidence interval for the mean of skeletal mass at this value of body mass. Exercise 11 on p. 592, based on the space shuttle data.