Chapter 8, Problem 8SE

Stroke Survival Rate The proportion of people who live after suffering a stroke is 0.85. Suppose there is a new treatment that is used to increase the survival rate. Use the parameter p to represent the population proportion of people who survive after a stroke. For a hypothesis test of the treatment's effectiveness, researchers use a null hypothesis of p = 0.85. Pick the correct alternative hypothesis.

$\text{i}\text{.} p\ne 0.85 \text{ii}\text{.} p>0.85 \text{iii}\text{.} p<0.85$