Unit 10 · Artificial Intelligence (AI) Paper 2 CS · September 2022

In a knowledge base, a rule is defined as (P1 and P2) or P3 → R1 (0.8) and R2 (0.3), where P1, P2, P3 are premises and R1, R2 are conclusions of the rule with certainty factors (CF) 0.8 and 0.3 respectively. If a running program has produced P1, P2, P3 with CF 0.5, 0.8 and 0.2 respectively, find the CF of the results on the basis of the premises.

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Correct answer: B. CF(R1) = 0.40, CF(R2) = 0.15

Explanation

AND takes the minimum: min(0.5, 0.8) = 0.5. OR takes the maximum: max(0.5, 0.2) = 0.5. Then CF(R1) = 0.5 × 0.8 = 0.40 and CF(R2) = 0.5 × 0.3 = 0.15.