=+22. Scan Errors. A company is considering buying a scanner. They would like to know whether Brand A, the more expensive scanner, is better than brand B. Eight documents were scanned by each of the two scanners and the number of errors made by each was recorded. The comparisons are shown in the table.

Document Brand A Brand B Difference (A-B)

1 17 20 –3 2 28 37 –9 3 19 16 3 4 15 20 –5 5 20 23 –3 6 26 29 –3 7 23 32 –9 8 28 36 –8 Identify an appropriate nonparametric method to compare the two brands of scanners and complete the test.