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10 cards from this deck
Relationship between two categorical variables
row total×col totalgrand total\frac{\text{row total} \times \text{col total}}{\text{grand total}}grand totalrow total×col total
At least 5
X2=∑(Oi−Ei)2EiX^2 = \sum \frac{(O_i - E_i)^2}{E_i}X2=∑Ei(Oi−Ei)2
(m−1)×(n−1)(m-1) \times (n-1)(m−1)×(n−1)
2×2 contingency tables only
No association between the variables
Group similar categories together
Positive or zero (differences are squared)
X2≥X^2 \geqX2≥ crit. value or p-value <<< significance level
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