Show that the mean vector and variance matrix for (dy,… ,dPj) in the distribution (1.18) are as…

Show that the mean vector and variance matrix for (dy,… ,dPj) in the distribution (1.18) are as asserted.

2. Consider again the mouse carcinogenesis data (data set V, Appendix A). Use the log-rank test (1.16) to test the hypothesis that germ-free isolation does not affect overall mortality.