ChiSquared Test
A very useful, robust, simple test which is worth knowing about. This test handles classification data eg. lived v died. As most frequently used the test is based around a 2 X 2 crosstabulation table although one can have any number of rows and columns. Consider the following table:
There are two groups of patients  one treatment and one control. These are then subclassified into those who lived and those who died. In practice you will use a computer to perform the calculations so I will list the logical steps:
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