Control chart (Ex 5-3) Subgroup No. Measurement Average Range Date Time X1 X2 X3 X4 X-bar R Comment 1 12/26 8:50 35 40 32 37 2 11:30 46 36 41 3 1:45 34 4 3:45 69 64 68 59 New, temporary operator 5 4:20 38 44 6 12/27 8:35 42 43 7 9:00 8 9:40 33 9 1:30 48 47 45 10 2:50 11 12/28 8:30 39 12 1:35 13 2:25 14 2:35 15 3:35 50

Control chart (Ex 5-3) Subgroup No. Measurement Average Range Date Time X1 X2 X3 X4 X-bar R Comment 16 12/29 8:25 33 35 29 39 17 9:25 41 40 34 Damaged oil line 18 11:00 38 44 28 58 19 2:35 37 20 3:15 56 55 45 48 Bad material 21 12/30 9:35 22 10:20 42 23 11:35 36 24 2:00 43 25 4:25

Control chart (Ex 5-3)

Revised Central Lines

Standard Values

Figure 5-6 Trial control limits and revised control limits for Xbar and R charts

A Framework for Applying the Different Quality Control Tools