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January 17, 2018 | Author: Anonymous | Category: Math, Statistics And Probability, Statistics
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Learning Goal: To be able to create and interpret frequency tables.

Definition A basic frequency table has two columns  One column lists all the categories of data.  The other column lists the frequency of each category, which is the number of data values in the category.

The grades on a statistics exam were: AABCCCBBBACCCCDF FAAFFCCCBBBAACDF AABCCCDA Construct a frequency table.

Definitions  The relative frequency of any category is

the proportion or percentage of the data values that fall in that category: Relative frequency=(frequency in category)/(total frequency)

 The cumulative frequency of any

category is the number of data values in that category and all preceding categories.  Add relative frequency and cumulative frequency to the previous frequency table.

Binning Data  When it is impossible or impractical to have a

category for every value in a data set, we bin (or group) the data into categories (bins), each covering a range of possible data values.  In general, the number of bins should be between 5 and 20. The purpose of binning data is to be able to understand the distribution of the data.

Copyright © 2009 Pearson Education, Inc.

Frequency table with the data binned.

Copyright © 2009 Pearson Education, Inc.

Dog Sled Racing How long does it take to finish the 1161-mile Iditarod Dog Sled Race from Anchorage to Nome, Alaska? Finish times (to the nearest hour) for 57 dogsled teams are shown below: 261

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288 288

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313 311

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Use bins to construct a frequency table.

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