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10 questions from this quiz
row total×column totalgrand total\frac{\text{row total} \times \text{column total}}{\text{grand total}}grand totalrow total×column total
5
X2=∑(Oi−Ei)2EiX^2 = \sum \frac{(O_i - E_i)^2}{E_i}X2=∑Ei(Oi−Ei)2
6
Only for 2×22 \times 22×2 tables
X2X^2X2 is always positive or zero
There is no association between the variables
When any expected frequency is below 5
Reject H0H_0H0, evidence of association
Reduces the X2X^2X2 value slightly
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