Question

The U.S. Trade Deficits for the last half of 1988 are shown in Figure 6.7. Use the data of Figure 6.7, and the blank form in Figure 6.8 to plot the time series graph for the U.S. Trade Deficits for the last half of 1988.

july august sept oct nov dec Mean(10.8)

1988 10.5 11.2 9.2 10.1 10.4 10.5 10.33

0.7 2 1 0.2 0.1 0.8

figure 6.7 : monthly US trade deficits, 1988 ($billions)

2. Use the data in figure 6.7 to compute the monthly moving ranges. Note that moving ranges are definied to be posotive values, and are found by computing the differences between successive values. Write these values in the space provided in figure 6.8, and the plot the running record of the moving ranges.

3. Compute the average trade deficit for the last half of 1988.

4. Compute the average moving range

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5. Compute the Natural Process Limits for the X-chart using the formulas on page 60 or on page 137. unpl= x + (2.66 x mr)

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6. Compute the Upper Range Limit using the formula on page 60 or on page 137. (url= 3.27 x mr)

Answer 1