Difference between revisions of "AP Statistics Curriculum 2007 EDA Freq"
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| − | You can copy the first 2 columns in the data table above | + | You can copy and paste the first 2 columns in the data table above in the [http://socr.ucla.edu/htmls/SOCR_Charts.html SOCR Charts] (BarChart --> XYPlot --> HistogramDemo7). You can see [[SOCR_EduMaterials_Activities_Histogram_Graphs | this SOCR Charts activity]] for help with histogram plots. |
* The graph below illustrates the (raw) frequency histogram (using counts) | * The graph below illustrates the (raw) frequency histogram (using counts) | ||
<center>[[Image:SOCR_EBook_Dinov_EDA_012708_Fig1.jpg|500px]]</center> | <center>[[Image:SOCR_EBook_Dinov_EDA_012708_Fig1.jpg|500px]]</center> | ||
Revision as of 11:26, 10 February 2008
Contents
General Advance-Placement (AP) Statistics Curriculum - Summarizing data with Frequency Tables
Summarizing data with Frequency Tables & Histograms
There are two ways to describe a data set (sample from a population) - Pictorial Graphs or Tables of Numbers. Both are important for analyzing data.
Definitions
- A frequency distribution is a display of the number (frequency) of occurrences of each value in a data set.
- A relative frequency distribution is a display of the percent (ratio or frequency to sample-size) of occurrences of each value in a data set.
Example
The table below shows the stage of disease at diagnosis of breast cancer in a random sample of 2092 US women.
| Stage | Frequency | Relative Frequency |
|---|---|---|
| 0 | 197 | 0.09 |
| I | 691 | 0.33 |
| II | 703 | 0.34 |
| III | 314 | 0.15 |
| IV | 187 | 0.09 |
| Total | 2092 | 1.00 |
Computational Resources: Internet-based SOCR Tools
- SOCR Charts allows you to generate graphical representations (including frequency histograms) of a variety of datasets.
- The SOCR Charts activities provide usage-instructions, examples and demonstrations of how to use SOCR Charts.
Hands-on activities
You can copy and paste the first 2 columns in the data table above in the SOCR Charts (BarChart --> XYPlot --> HistogramDemo7). You can see this SOCR Charts activity for help with histogram plots.
- The graph below illustrates the (raw) frequency histogram (using counts)
- The graph below show the relative frequency histogram (using the last column of the table above).
References
- SOCR Home page: http://www.socr.ucla.edu
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