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Unformatted text preview: 2 1Chapter TwoDescribing Data: Frequency Distributions and Graphic Describing Data: Frequency Distributions and Graphic PresentationPresentationGOALSONEOrganize data into a frequency distribution.TWOPortray a frequency distribution in a histogram, frequency polygon, and cumulative frequency polygon.THREEPresent data using such graphic techniques as line charts, bar charts, and pie charts.Goals2 2Frequency DistributionA Frequency DistributionFrequency Distributionis a grouping of data into mutually exclusive categories showing the number of observations in each class.2 3Determining the question to be addressedConstructing a frequency distribution involves:Constructing a frequency distribution2 4Determining the question to be addressedConstructing a frequency distribution involves:Collecting raw dataConstructing a frequency distribution2 5Determining the question to be addressedConstructing a frequency distribution involves:Collecting raw dataOrganizing data (frequency distribution) Constructing a frequency distribution2 6Determining the question to be addressedConstructing a frequency distribution involves:Collecting raw dataOrganizing data (frequency distribution) Presenting data (graph)Constructing a frequency distribution2 7Determining the question to be addressedConstructing a frequency distribution involves:Collecting raw dataOrganizing data (frequency distribution) Presenting data (graph)Drawing conclusionsConstructing a frequency distribution2 8Collecting raw dataOrganizing data (frequency distribution) Presenting data (graph)Drawing conclusions1.53.55.57.59.511.513.55101520Constructing a frequency distribution2 9Class MidpointClass Midpoint::A point that divides a class into two equal parts. This is the average of the upper and lower class limits....
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This note was uploaded on 04/06/2009 for the course ECON 41 taught by Professor Guggenberger during the Spring '07 term at UCLA.
 Spring '07
 Guggenberger

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