Chapter2

Chapter2 - Grouping Quantitative Data Below displays the...

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Grouping Quantitative Data Below displays the mid-term grades in a statistics class for 2009 Fall. 84 90 82 74 75 88 91 42 81 73 82 86 93 83 91 86 90 93 96 93 79 98 71 92 78 79 86 61 92 96 67 69 58 82
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Grouping Quantitative Data: Three steps in grouping: - -2 Decide the number of classes -3 Pay attention to cutting point
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Grouping Quantitative Data Three important guidelines: 1: Number of classes between 5~20 2: Each observation must belong to one and only one class 3: Whenever feasible, all classes should have the same width
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Grouping Quantitative Data: Grades Count <60 2 60~70 3 70~80 7 80~90 10 90~100 12
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Grouping Quantitative Data: Grades Relative Frequency <60 2/34=0.0588 60~70 3/34=0.0882 70~80 7/34=0.2059 80~90 10/34=0.2941 90~100 12/34=0.3529
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Lower cutpoint: smallest value in a class Upper cutpoint: the smallest value that could go in the next higher class Midpoint: average of cutpoints.
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This note was uploaded on 01/09/2012 for the course 960 211 taught by Professor Lawerence during the Spring '08 term at Rutgers.

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Chapter2 - Grouping Quantitative Data Below displays the...

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