Chapter 2: Q.2.71 (page 69)
Use cutpoint grouping with the first cutpoint of and a class width of .
Short Answer
a). The frequency distribution,
b). Relative frequency distribution,
c). Frequency histogram,
Chapter 2: Q.2.71 (page 69)
Use cutpoint grouping with the first cutpoint of and a class width of .
a). The frequency distribution,
b). Relative frequency distribution,
c). Frequency histogram,
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Get started for freeExam 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?
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.
Construct a stem-and-leaf diagram for the data, using one line per stem.
Standard Normal Distribution. One of the most important distributions in statistics is the standard normal distribution. We discuss this distribution in detail in Chapter 6.
a. Use the technology of your choice to generate a sample of 3000 observations from a variable that has the standard normal distribution.
b. Use the technology of your choice to get a relative-frequency histogram for the 3000 observations that you obtained in part (a).
c. Based on the histogram you obtained in part (b), what specific shape does the standard normal distribution have? Explain your reasoning.
Detroit Tigers. From the Baseball Almanac website, we found the heights, in inches, of the players on the 2012 World Series runner-up Detroit Tigers baseball team.
Use the graph to answer the following questions. Note that cholesterol levels are always expressed as whole numbers.
a. Construct a stem-and-leaf diagram of these data with five lines per stem.
b. Why is it better to use five lines per stem here instead of one or two lines per stem?
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