Chapter 2: Q. 2.76 (page 69)
Construct a stem-and-leaf diagram for the data, using one line per stem.

Short Answer

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Chapter 2: Q. 2.76 (page 69)
Construct a stem-and-leaf diagram for the data, using one line per stem.


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Suppose that you have a data set that contains a large number of observations. Which graphical display is generally preferable; a histogram or a stem-and-leaf diagram? Explain your answer.
Draw a smooth curve that represents a symmetric trimodal (three-peak) distribution.
University Patents. The number of patents a university receives is an indicator of the research level of the university. From a study titled Science and Engineering Indicators issued by the National Science Foundation, we found the number of U.S. patents awarded to a sample of private and public universities to be as follows.

Construct a stem-and-leaf diagram for these data with
a. one line per stem.
b. two lines per stem.
c. Which stem-and-leaf diagram do you find more useful? Why?
Acute Postoperative Days. Several neurosurgeons wanted to determine whether a dynamic system (Z-plate) reduced the number of acute postoperative days in the hospital relative to a static system (ALPS plate). R. Jacobowitz, Ph.D., an Arizona State University professor, along with G. Vishteh, M.D., and other neurosurgeons obtained the following data on the number of acute postoperative days in the hospital using the dynamic and static systems.

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.

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