Looking at the days (rows) as blocks, rework Exercise 12.5 by the method of Section 12.3.

Data From Exercise 12.5

Transcribed Image Text:

12.5 The following are the numbers of mistakes made in 5 successive days for 4 technicians working for a pho- tographic laboratory: Technician Technician Technician Technician I II IV 5 17 9 12 12 11 13 9 15 6 8 14 14 10 11 17 10 11 93706 Test at the level of significance a = 0.01 whether the differences among the 4 sample means can be attributed to chance.