Chi Square Test Definition And Formula. Null hypothesis a variable follows a hypothesized distribution. Chi square goodness of fit test.
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It is used to find out how closely actual data fit with expected data. X 2 σ o e 2 e. Alternative hypothesis a variable does not follow a hypothesized distribution.
The data used in calculating a chi square statistic must be random raw mutually exclusive drawn.
A chi square goodness of fit test uses the following null and alternative hypotheses. Chi square test of independence. Null hypothesis the two variables are independent. Chi square is a method that is used in statistics and it calculates the difference between observed and expected data values.
