MATH 2283 Lecture 2: Chapter 2 Notes

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Creating a Freq. Dist. Using Grouped Quantitative Data (Histogram) o Number of classes should ideally be between 4 and 20 One method to determine the number of classes is 2 n , where k = number of classes, n = number of data points once k is known, the width is found by: Estimated class width = (Max data value minimum data value)k o Round to whole number Class boundaries the minimum and maximum values for each class o choose class boundaries that are easy to read *Rules for Classes for Grouped Data* 1.Equalsize classes. 2.Mutually exclusive classes: class boundaries cannot overlap. 3.Include all data values. 4.Avoid empty classes. 5.Avoid openended classes: infinite. Some data are technically discrete but displayed in a continuous format