01Frequency Distributions - FREQUENCY DISTRIBUTIONS A...

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F REQUENCY D ISTRIBUTIONS A population is the complete collection of measurements, objects, or individuals under study. A survey of the entire population is called a census . A sample is a portion or subset taken from a population. Therefore, sample results will not always accurately reflect the population. However, if sampling is done properly and scientifically the sample results will be sufficiently accurate. A random sample is a sample in which each member of the population has the same chance of being selected. A frequency distribution or frequency table groups data items into classes and then records the number of items that appear in each class. The classes can either be continuous or discontinuous. Ex . Arrange the following heights (in cm) of a group of students into a frequency table. 156 172 168 153 170 160 170 156 160 160 172 174 150 160 163 152 157 158 162 154 159 163 157 160 153 154 152 155 150 150 152 152 154 151 151 154 Choose your interval width so that there are about 10 classes or intervals. (ie. the first
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This note was uploaded on 07/12/2011 for the course MATH 241 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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01Frequency Distributions - FREQUENCY DISTRIBUTIONS A...

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