Online directory While surfi ng the Internet one day, Raul

Chapter 9, Problem 9.60

(choose chapter or problem)

Online directory While surfi ng the Internet one day, Raul fi nds this claim about the site www.whitepages.com: We cover 80% of U.S. adults. Raul thinks the site is exaggerating. (a) Describe the details of a study that Raul could realistically perform to investigate this claim. (b) If Raul performs a signifi cance test using the data from the study in (a), is it possible that the conclusion he draws about the claim is wrong? Explain. (c) If Raul calculates a confi dence interval using the data from the study in (a), is it possible that the conclusion he draws about the claim is wrong? Explain.

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