The following performance data was collected under similar conditions on two inspectors removing defective products from the assembly line. Comment on the relative performance of the two inspectors. Which one is better at finding defects? Which would you hire if the cost of releasing of a defective product would be high? Which does an overall better job?

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Case #2 Case #1 Inspector Hit rate 0.81 0.41 JRS False alam rate 0.21 0.84 0.15 0.55 Hit rate ABD False alam rate 0.31 0.44 Case #1 z values for probability z (0.5 - 0.81)= -0,878 z (0.5 - 0.21) = 0.807 z (0.5 - 0.84)= -0.995 z (0.5 - 0.44) = 0.151 Case #2 z values for probability 0.807 - (-0.878) = z (0.5 - 0.41) = 0.227 Inspector d" d' 1.037 - (0.227) = 0.810 JRS 1.685 z (0.5 - 0.15) =1.037 0.151 - (-0.995)= z (0.5 - 0.55) = -0.126 0.496 - (-0.126) = 0.622 ABD 1.146 z (0.5 - 0.31) = 0.496