Stat 322 – HW 7
Due Friday, March
2
Remember to include relevant Minitab output
1) exercise 26 (p. 584) and provide a 95% confident interval for the coefficient of the quadratic predictor.
2) exercise 38 (p. 604)
3) exercise 39 (p. 304-5)
4) exercise 44
5) The data in BirdExtinction.mtw includes measurements on breeding pairs of land-bird species collected from 16 islands around Britain over the course of several decades. For each species, the data set contains an average time of extinction on those islands where it appeared (actually 1+1/T where T is length of time species remained on island and 1/T is set to zero if the species did not become extinct on the island), the average number of nesting pairs, the size of the species (categorized as large or small), and the migratory statues of the species (migrant or resident). It is expected that species with larger numbers of nesting pairs will tend to remain longer before becoming extinct. Of interest is whether, after accounting for number of nesting pairs, size or migratory status has any effect. There is also some interest in whether the effect of size differs depending on the number of nesting pairs. If any species have unusually small or large extinction times compared to other species with similar values of the explanatory variables, it would be useful to point them out. Analyze the data to answer these questions and write a summary of your statistical findings. Don’t forget to complete a residual analysis and consider transformations if necessary.