Chapter 2: Q. 2.76 (page 69)
Construct a stem-and-leaf diagram for the data, using one line per stem.
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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Get started for freeIn a current newspaper or magazine, find two examples of graphs that might be misleading. Explain why you think the graphs are potentially misleading.
Exam Scores. Construct a dot plot for the following exam scores of the students in an introductory statistics class.
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.
For data that are grouped in classes based on more than a single value, lower-class limits (or cut points) are used on the horizontal axis of a histogram for depicting the classes. Classmarks (or midpoints) can also be used, in which case each bar is centered over the mark (or midpoint) of the class it represents. Explain the advantages and disadvantages of each method.
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.
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