The equations for the acceptance and rejection lines for an item-by-item sequential sampling plan are given as follows:

X _A = -0.95 + 0.06 n

X _R = 3.22 + 0.06 n

(A) An inspector tests 18 item without finding a single defective one. Under this plan should he have decided to accept the lot before reaching the 18 ^{th item? Explain.}

(B) What is the minimum number of items he should inspect before rejecting a lot?