Consider the renewable energy data in Exercise 15-96.

(a) Construct an EWMA control chart with λ = 0.2 and L = 3. Do the data appear to be generated from an in control process?

(b) Construct an EWMA control chart with λ = 0.5 and L = 3 and compare your conclusion to part (a).

Exercise 15-96

The following data from the U.S. Department of Energy Web site (www.eia.doe.gov) reported the total U.S. renewable energy consumption by year (trillion BTU) from 1973 to 2004.

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Total Renewable Total Renewable Energy Consumption (Trillion BTU) Energy Consumption Year Year (Trillion BTU) 1973 4433.121 1989 6294.209 1974 1990 4769.395 6132.572 1975 4723.494 1991 6158.087 5907.147 1976 4767.792 1992 1993 1977 4249.002 6155.959 1978 5038.938 1994 6064.779 1979 6669.261 5166.379 1995 1980 5494.420 1996 7136.799 7075.152 1981 5470.574 1997 6560.632 1982 5985.352 1998 1999 6598.630 1983 6487.898 2000 1984 6430.646 6158.232 1985 6032.728 2001 5328.335 6131.542 2002 1986 5835.339 1987 5686.932 2003 6081.722 2004 1988 5488.649 6116.287