Chi Square Calculator for 2x2

This simple chi-square calculator tests for association between two categorical variables - for example, sex (males and females) and smoking habit (smoker and non-smoker).

Requirements

  • Random sample
  • Observations must be independent of each other (so, for example, no matched pairs)
  • Cell count must be 5 or above for each cell in a 2 x 2 contingency table

Null Hypothesis

The null hypothesis asserts the independence of the variables under consideration (so, for example, gender and voting behavior are independent of each other).

Equation

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