SNHU Statistical Concepts in Public Health Question

Question Description

I’m studying and need help with a Statistics question to help me learn.

You are analyzing the results of a study comparing the 5-year incidence of a disease
between subjects randomized to Drug A or a placebo. In addition to estimating sample
time-to-disease curves via the Kaplan-Meier method, you
also plan to use a log-rank test compute a p-value. The corresponding null and
alternative hypotheses are as follows:

Ho: S drug A (t)= S placebo (t)

HA: S drug A (t) ≠S placebo (t)

Under what assumption is the p-value computed, and interpreted?