Question: Refer to the previous exercise. At the Inference for a Proportion applet at www.pearsonglobal editions.com/Agresti, enter 0 successes for n = 20. Click on Confidence

Refer to the previous exercise. At the Inference for a Proportion applet at www.pearsonglobal editions.com/Agresti, enter 0 successes for n = 20.

Click on Confidence Interval for type of inference. Why are the reported standard error and confidence interval not sensible? Clicking on the Agresti–Coull adjustment

(introduced on page 138) gives a sensible alternative to the score confidence interval.

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