Question: Basic Computation: Confi dence Interval for p1 p2 Consider two independent binomial experiments. In the fi rst one, 40 trials had 10 successes. In

Basic Computation: Confi dence Interval for p1 p2 Consider two independent binomial experiments. In the fi rst one, 40 trials had 10 successes. In the second one, 50 trials had 15 successes.

(a) Check Requirements Is it appropriate to use a normal distribution to approximate the pˆ1 pˆ2 distribution? Explain.

(b) Find a 90% confi dence interval for p1 p2.

(c) Interpretation Based on the confi dence interval you computed, can you be 90% confi dent that p1 is less than p2? Explain.

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