Problem: Re-consider the burn data in R package KMSurv on the times until staphylococcus infection of burn patients. Use the variables Z1 (Treatment: 0-routine bathing 1-Body cleans- ing), T 3 (Time to straphylocous aureaus infection or on study time) and D3 (Straphylocous aureaus infection: 1=yes 0=no) for the problems.