AP Statistics Curriculum 2007 EDA Freq

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

Stage of disease at diagnosis of breast cancer in a random sample of 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.

Hands-on activities

You can copy the first 2 columns in the data table above ans paste it in the SOCR Charts (BarChart --> XYPlot --> HistogramDemo7). You can see this SOCR Charts activity for help with histogram plots.

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References

• Lecture notes on EDA

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• SOCR Home page: http://www.socr.ucla.edu

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