Review Exercises 81 7. A sample of 100 students was asked how many hours per week they spent studying. The following frequency distribution shows the results. Construct a frequency histogram for these data. Number of Hours Frequency 1.0 – 4.9 14 5.0 – 8.9 34 9.0 – 12.9 29 13.0 – 16.9 15 17.0 – 20.9 8 8. Construct a relative frequency histogram for the data in Exercise 7. 9. List the data in the following stem-and-leaf plot. The leaf represents the ones digit. 1 1 1 5 5 9 9 9 2 2 2 3 5 7 8 3 0 0 8 4 4 5 7 8 5 0 1 3 3 5 6 8 10. Following are the prices (in dollars) for a sample of coffee makers. 19 22 29 68 35 37 28 22 41 39 28 Construct a stem-and-leaf plot for these data. 11. Following are the prices (in dollars) for a sample of espresso makers. 99 50 31 65 50 99 70 40 25 56 30 77 Construct a stem-and-leaf plot for these data. 12. Construct a back-to-back stem-and-leaf plot for the data in Exercises 10 and 11. 13. Construct a dotplot for the data in Exercise 10. 14. The following table presents the percentage of Americans who use a cell phone exclusively, with no landline phone, for the years 2005–2009. Construct a time-series plot for these data. Time Period Percent January–June 2005 6.7 July–December 2005 7.7 January–June 2006 9.6 July–December 2006 11.8 January–June 2007 12.6 July–December 2007 14.5 January–June 2008 16.1 July–December 2008 18.4 January–June 2009 21.1 Source: National Health Interview Survey 15. According to the area principle, if one amount is twice as much as another, its image should have as much area as the other image. Review Exercises 1. Trust your doctor: The General Social Survey recently surveyed people to ask, “How much would you trust your doctor to put your health above costs?” The following relative frequency bar graph presents the results. 0 0.05 0.10 0.15 0.20 0.25 0.30 Completely Mostly Somewhat A little Not at all Relative Frequency Source: General Social Survey
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