8-56. Of 1000 randomly selected cases of lung cancer, 823
resulted in death within 10 years.
(a) Calculate a 95% two-sided confidence interval on the
death rate from lung cancer.
(b) Using the point estimate of p obtained from the preliminary
sample, what sample size is needed to be 95% confident
that the error in estimating the true value of p is less
than 0.03?
EXPERT ANSWER
