8 8 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 i p 0 85 ii p 0 85 iii p 0 85