Figure 15.20 gives the Minitab output of using double exponential smoothing in month 20 to forecast watch

Question:

Figure 15.20 gives the Minitab output of using double exponential smoothing in month 20 to forecast watch sales in months 21 through 26. Here we have used Minitab€™s default option that sets each of the smoothing constants alpha and gamma equal to .2. Find and report the point prediction of and a 95 percent prediction interval for watch sales in month 21.

Minitab Output of Using Double Exponential Smoothing to Forecast Watch Sales FIGURE 15.20 Double Exponential Smoothing P