Three million people in Sweden are trained in CPR, which is more than 30% of the population. The data set is summarized below. A 2015 study by Hasselqvist-Ax et. al reported in the New England Journal of Medicine examined the relationship between bystander CPR (Cardio Pulmonary Resuscitation) and positive outcomes for out-of hospital cardiac arrest cases. Researchers collected data on whether or not the victim received CPR from a bystander and whether or not the victim survived. The results are shown in the following table.

a. Find the survival percentage for both groups and compare them.

b. Test the hypothesis that bystander CPR is independent of survival using a 0.05 significance level.

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CPR No CPR Survived 1,629 595 Died 13,883 14,274