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? Understanding Variation/Managing Chaos 1989 Trade Deficits (X) Moving Ranges X mR 13.0 12.0 Figure 6.9: Monthly U.S. Trade Deficits, 1989 (5 billions) 11.0 10.0 9.0 8.0 7.0 6.0 3.0 20 1.0 Jan 8.7 0 Feb 8.7 Jan Mar Apr 7.0 6.8 Feb May Mar Apr 9.6 May 90 Figure 6.10: Form for XmR Chart