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Unformatted text preview: I. TYPES OF FREQUENCY DISTRIBUTIONS \\XVL ‘ GA A. DEFINITION OF A FREQUENCY DISTRIBUTION W «501: , W {’0 ' G g, A frequency distribution may be defined as an V‘A NGNJ WWI? , arrangement of homogeneous data by classes. ” (AFF€£MV4L - M B. RULES FOR CONSTRUCTING A FREQUENCY DISTRIBUTION 1. We should never use fewer than or more than classes. 2. We always choose classes which are such that all the data can be accommodated. 3. We always make sure that each item belongs to only one class. 4. Whenever possible, we make the class intervals of equal width. C. CLASS FREQUENCIES, CLASS LIMITS, CLASS BOUNDARIES, CLASS MARKS, AND A CLASS INTERVAL 1. Class frequencies are the numbers which show how many observations fall into each class. 2. Class limits are the smallest and largest values that can go into any given class. 3. Class boundaries are the midpoints between the upper class\limit of one class and the lower class limit of the next class. 4. Class marks are the midpoints of the classes. 5. A class interval is the width of a class. It is determined by taking the difference between class boundaries for a class. ‘ D. EXAMPLE OF A FREQUENCY DISTRIBUTION ORGANIZING AND PRESENTING DATA The following sample data, obtained in an air pollution study, are 80 determinations of the daily emission of sulfur oxide (in pounds) of an industrial plant: PAGE I ...
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