1. Basing ?ndings on 60 successful pregnancies involving natural birth, an experimenter found that the mean pregnancy term was 274 days, with a standard deviation of 14 days. Construct a 99% con?dence interval for the true mean pregnancy term μ.
2. Let Y be the binomial random variable with parameter p and n = 400. If the observed value of Y is y = 120, ?nd a 95% con?dence interval for p.