Page 493 Case Study: The BRFSS survey results can be found online at www.cdc.gov/mmwr/preview/mmwrhtml/mm6426a1.htm.

Page 494 Example 1: The Gallup survey results about soda consumption can be found online at www.gallup.com/poll/184436/majority-americans-say-try-avoid-drinking-soda.aspx.

Page 498 For the state of the art in confidence intervals for , see Alan Agresti and Brent Coull, “Approximate is better than ‘exact’ for interval estimation of binomial proportions,” American Statistician, 52 (1998), pp. 119–126. You can also consult the book An Introduction to Categorical Data Analysis, Wiley, 1996, by Alan Agresti. We note that the accuracy of our confidence interval for can be greatly improved simply by “adding 2 successes and 2 failures.” That is, replace by (count of successes + + . Texts on sample surveys give confidence intervals that take into account the fact that the population has finite size and also give intervals for sample designs more complex than an SRS.

Page 509 Example 7: Information about the NAEP test can be found online at http://nces.ed.gov/nationsreportcard/pdf/main2009/2010451.pdf

Page 511 Exercise 21.4 is based on a survey found online at www.nhtsa.gov/nti/811841.

Page 511 Exercise 21.5 is based on a survey found online at www.tiaa-cref.org/public/about/press/about_us/releases/articles/pressrelease486.html.

Page 513 Exercise 21.11: The poll can be found on the Gallup website. Go to www.gallup.com/poll/180455/lack-teacher-engagement-linked-million-missed-workdays.aspx.

Page 513 Exercise 21.12: The poll can be found on the Pew Research Center website. Go to www.people-press.org/2014/12/10/growing-public-support-for-gun-rights/.

Page 513 Exercise 21.13: The poll results can be found at www.pewinternet.org/2015/09/15/libraries-at-the-crossroads/.

Page 514 Exercise 21.16: The poll results can be found at www.cbsnews.com/news/do-americans-think-their-health-care-costs-are-affordable/.

Page 515 Exercise 21.21: Jeff Zeleny and Megan Thee-Brenan, “New poll finds a deep distrust of government,” New York Times, October 25, 2011.

Page 515 Exercise 21.22 is based on a report found at www.bizjournals.com/milwaukee/news/2014/03/19/harley-selling-more-motorcycles-both-in-u-s-and.html.

Page 516 Exercise 21.29: The poll results can be found at www.greenerchoices.org/pdf/Consumer-ReportsFoodLabelingSurveyJune2014.pdf.

Page 516 Exercise 21.30: Sara J. Solnick and David Hemenway, “Complaints and disenrollment at a health maintenance organization,” Journal of Consumer Affairs, 26 (1992), pp. 90–103.

Page 516 Exercise 21.31: The data are from the CPS website, www.bls.gov/web/empsit/cpseea03.pdf.

Page 517 Exercise 21.34: Data provided by Darlene Gordon, Purdue University.