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10 cards from this deck
χ² = Σ(O-E)²/E
df = n - 1
p = 0.05 (5%)
No significant difference between observed and expected
Accept null hypothesis - differences due to chance
Reject null hypothesis - significant difference exists
9:3:3:1
1:1:1:1
Two large and two small phenotypic classes
Categorical data - data sorted into distinct groups
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