11. Out-of-class activity Each student should find an article in a professional journal that includes a confidence interval of the type discussed in this chapter. Write a brief report describing the confidence interval and its role in the context of the article. 12. In-class activity Each student should first estimate the height of the current U.S. president in (a) feet; (b) meters. Combine all estimates to create a data set of estimates in feet and a second data set with estimates in meters. For each of the two data sets, (a) describe the distribution of estimates, (b) find the mean and standard deviation, and (c) construct a 95% confidence interval estimate of the mean of the population of all such estimates. Find the actual height of the president and compare it to the confidence interval estimates. Finally, identify the countries that are not on the metric system. 13. Out-of-class activity Working in groups of three or four students, each group should make observations and collect data to estimate the proportion of cars that fail to come to a complete stop at a particular stop sign. Use the sample data to construct a 95% confidence interval estimate of that proportion. 14. In-class activity Each student should estimate the current age of the person in the accompanying photograph. All of the estimates should be collected and a 95% confidence interval estimate should be found from the results. Does the 95% confidence interval estimate capture the true age of the person in the photograph? CHAPTER 7 Cooperative Group Activities 371
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