8-56. Of 1000 randomly selected cases of lung cancer, 823

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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?

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