The cost curve shows the average cost of inspection (y-axis) for different incoming qualities (bottom axis). The cost of inspection is:
Cost(p) = C0 x ASN(p) + C1 x E{# Stages}(p)
where C0 is the per unit cost of inspection, C1 is the per stage cost of inspection, ASN(p) is the average sample number at quality level p and E{# Stages}(p) is the expected number of stages at quality level p. The values of C0 and C1 are specified using the Cost Parameters dialog box. In the plot above, C0=0 and C1=1 so Cost(p) = E{# Stages}(p).
