Basic Computation: Confidence Interval for p1 2 p2 Consider two independent binomial experiments. In the first one, 40 trials had 15 successes. In the second one, 60 trials had 6 successes.

(a) Check Requirements Is it appropriate to use a normal distribution to approximate the pˆ pˆ 1 2 2 distribution? Explain.

(b) Find a 95% confidence interval for p1 2p2.

(c) Interpretation Based on the confidence interval you computed, can you be 95% confident that p1 is more than p2? Explain.

AppendixLO1