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Chi-Square Statistical Analysis

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   Oral Cancer - Tobacco

A knowledge of basic statistics is important for the researcher.

Describe your data:  

Total Number or "N", Mean, Median, Mode and Standard Deviation are used to describe your data. 

Thus for the data sequence of 2, 5, 7, 9, 10, 12, 12, 18, 20

The Standard Deviation is a description of how tightly the observed data points are clustered around the mean.   One standard deviation should include approximately 68% of the data points.  Two Standard Deviations should include approximately 95% of the data points and three Standard Deviations should include approximately 99% of the data points. 

For the above example one Standard Deviation is 5.85.  

Microsoft Excel and Sun Microsystems's Open Office can calculate Standard Deviation and Means.    Download Open Office


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