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10 cards from this deck
p ≤ 0.05 (5% or less)
No significant difference between observed & expected results
Comparing observed frequencies with expected frequencies
χ2=∑(O−E)2E\chi^2 = \sum \frac{(O-E)^2}{E}χ2=∑E(O−E)2
Number of categories - 1
Comparing means from two independent groups
(n1+n2)−2(n_1 + n_2) - 2(n1+n2)−2
-1 to +1
n−2n - 2n−2
Calculated χ² > critical value at p=0.05
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