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Unequal class intervals The small number of observations greater than 7 in Exercise 119 may cause some difficulty in constructing a frequency distribution. To keep class intervals equal, one is faced with the dilemma of either creating too many classes for only 30 observations or using a small number of classes with excessive loss of information in the first few classes. In such cases, one is tempted to drop the rule of equal-size classes, using a larger interval for the last class.
(a) If that were done, what would the resulting frequency distribution become?
(b) Is there a unique class interval?
Exercise 119
The following are the number of highway accidents reported on 30 successive days in a certain county:
Construct a frequency distribution of these data. Identify the class boundaries, the class marks, and the class interval.
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