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10 cards from this deck
One's occurrence doesn't affect other's probability
P(A)×P(B)P(A) \times P(B)P(A)×P(B)
Whether two events are statistically independent
The two events are statistically independent
All entries must be ≥5\geq 5≥5
Combine columns to eliminate small values
(O−E)2E\frac{(O - E)^2}{E}E(O−E)2
(rows−1)×(columns−1)(rows - 1) \times (columns - 1)(rows−1)×(columns−1)
When ν=1\nu = 1ν=1 (1 degree of freedom)
(∣O−E∣−0.5)2E\frac{(|O - E| - 0.5)^2}{E}E(∣O−E∣−0.5)2
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