Computing K

P(A) = Z/N = 10/13 = 0.77

NC = 39

P(E) = (C1/NC)2 + (C2/NC)2 + (C3/NC)2 =

(16/39)2 +(10/39)2 +(13/39)2 =

0.17 + 0.07 + 0.11 = 0.35

K = P(A) – P(E) / 1 – P(E) =

(0.77 – 0.35) / (1 – 0.35) =

0.42/0.65 = 0.65

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