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#### Concept explainers

**Testing Claims About Proportions. In Exercises 7–22, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim**.

**9. Smoking Cessation Programs** Among 198 smokers who underwent a “sustained care” program, 51 were no longer smoking after six months. Among 199 smokers who underwent a “standard care” program, 30 were no longer smoking after six months (based on data from “Sustained Care Intervention and Postdischarge Smoking Cessation Among Hospitalized Adults,” by Rigotti et al., *Journal of the American Medical Association*, Vol. 312, No. 7). We want to use a 0.01 significance level to test the claim that the rate of success for smoking cessation is greater with the sustained care program.

**a.** Test the claim using a hypothesis test.

**b.** Test the claim by constructing an appropriate confidence interval.

**c.** Does the difference between the two programs have practical significance?

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# Chapter 9 Solutions

Essentials of Statistics (6th Edition)

# Additional Math Textbook Solutions

Statistics: The Art and Science of Learning from Data (4th Edition)

Elementary Statistics: Picturing the World (6th Edition)

Statistics for Psychology

Intro Stats, Books a la Carte Edition (5th Edition)

- What term is used to express the likelihood of an event occurring? Are there restrictions on its values? If so, what are they? If not, explain.
*arrow_forward*What is an experiment? Give two examples.*arrow_forward*What is the difference between events and outcomes? Give an example of both using the sample space of tossing a coin 50 times.*arrow_forward*

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