13-20. Suppose two different inspection procedures are being compared using ten pairs of inspectors, matched by years of experience, and so on. The inspectors within each pair are randomly assigned to one of the two procedures and the numbers of items inspected/hour are:

Pair: 1 2 3 4 5 6 7 8 9 10 Procedure 1: 11 10 9 10 9 12 13 9 8 11 Procedure 2: 15 12 10 12 8 12 15 14 10 13 Is Procedure 2 more effective than Procedure 1? Use the Wilcoxon signed rank test with α = 0.01.