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Chapter 2: Q. 8 (page 88)
When is the use of single-value grouping particularly appropriate?
When there are only a few different values in the data
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Days to Maturity for Short-Term Investments. Refer to the days-to-maturity data in Table 2.6 on page 53 . Note that there are observations, the smallest and largest of which are and , respectively. Apply the preceding procedure to choose classes for limit grouping. Use approximately seven classes. Note: If in Step you decide on for the class width and in Step you choose for the lower limit of the first class, then you will get the same classes as used in Example 2.13; otherwise, you will get different classes (which is fine).
Baltimore Ravens. From Player Roster, the official roster of the 2013 Super Bowl champion Baltimore Ravens, we obtained the heights, in inches, of the players on that team. A dot plot of those heights is as follows.
Explain the meaning of
Qualitative Variable
Discrete, Quantitative Variable
Continuous, Quantitative Variable
Provide a reason why the classification of data is important
As mentioned, for relative-frequency polygons, we label the horizontal axis with class marks in limit grouping and class midpoints in cut point grouping. How do you think the horizontal axis is labeled in single-value grouping.
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