For Exercises 12 and 13, follow steps (a)–(d).
13. Confidence level 95%, ,
8.99.13
(a) (b) is and is (c) . We can estimate the population proportion to within 0.0087 with 95% confidence. (d) (0.0013, 0.0187). We are 95% confident that the population proportion lies between 0.0013 and 0.0187.