Chapter 2: Q. 5 (page 88)
Identify two main types of graphical displays that are used for qualitative data.
Bar charts and pie charts are the two most used types of graphical displays for qualitative data.
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Exam Scores. The exam scores for the students in an introductory statistics class are as follows.
a. Group these exam scores, using the classes , and .
b. What are the widths of the classes?
c. If you wanted all the classes to have the same width, what classes would you use?
Stays in Europe and the Mediterranean. The Bureau of Economic Analysis gathers information on the length of stay in Europe and the Mediterranean by U.S. travelers. Data are published in the Survey of Current Bussiness. The following stem-and-leaf diagram portrays the length of stay, in days, of a sample of 36 U.S. residents who traveled to Europe and the Mediterranean last year.
Women in the Workforce. In an issue of Science (Vol. 308, No. 5721 , p. 483), D. Normile reported on a study from the Japan Statistics Bureau of theindustrialized countries in the Organization for Economic Co-operation and Development (OECD) titled "Japan Mulls Workforce Goals for Women." Following are the percentages of women in scientific workforces for a sample of countries. Construct a stem-and-leaf diagram for these percentages.
Sickle Cell Disease. A study published by E. Anionwu et al. in the British Medical Journal (Vol, 282, pp .283-286) measured the steady-state hemoglobin levels of patients with three different types of sickle cell disease. Following is a stem-and-leaf diagram of the data.
For quantitative data, we examined three types of grouping: single-value grouping, limit grouping, and cut point grouping. For each type of data given, decide which of these three grouping types is usually best, Explain your answers.
a. Continuous data displayed to one or more decimal places
b. Discrete data in which there are relatively few distinct observations
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