Chi Squared Test Statistic Formula. Alternative hypothesis the two variables are not independent. Chi square test of independence.
Alternative hypothesis the two variables are not independent. Null hypothesis the two variables are independent. The chi square test statistic is calculated as.
Since the test name itself is chi squared we calculate χ2 using the above formula.
Calculating a chi square test statistic. X 2 σ o e 2 e. The result of this process is a nonnegative real number that tells us how much different the actual and expected counts are. A chi square goodness of fit test is used to determine whether or not a categorical variable follows a hypothesized distribution.
