Understanding Variation/Managing Chaos Figure 6.9: Monthly U.S. Trade Deficits, 1989 (5 billions) Mar Ape Jan 8.7 Feb 8.7 May Jun 7.0 6.8 9.6 1989 90 Jan Feb Mar Apr May Jun MR 13.0 12.0 11.0 Trade Deficits (X) 10.0 9.0 8.0 7.0 6.0 3.0 2.0 Moving Ranges 1.0 0 Figure 6.10: Form for XmR Chart There are two indications of shifts in Figure 6.10. The first shif favorable, and the second was unfavorable. 9. When is this favorable shift detected 10. When might this favorable shift have begun? 11. When is the unfavorable shift detected? 116 Understanding Variation/Managing Chaos Figure 6.9: Monthly U.S. Trade Deficits, 1989 (5 billions) Mar Ape Jan 8.7 Feb 8.7 May Jun 7.0 6.8 9.6 1989 90 Jan Feb Mar Apr May Jun MR 13.0 12.0 11.0 Trade Deficits (X) 10.0 9.0 8.0 7.0 6.0 3.0 2.0 Moving Ranges 1.0 0 Figure 6.10: Form for XmR Chart There are two indications of shifts in Figure 6.10. The first shif favorable, and the second was unfavorable. 9. When is this favorable shift detected 10. When might this favorable shift have begun? 11. When is the unfavorable shift detected? 116