Suppose the data in problem 4 were given as follows:

a. Using the trend-corrected version of the exponential smoothing model, with α = β = 0.2, forecast next week's volume.
b. Estimate the error in the above forecast (SF). Use the last six weekly periods.
c. Construct a 95-percent confidence band on the forecast assuming a normal distribution of requirements.

Week Volume Week Volume 10 weeks ago 1,567,000 5 wecks ago 2,056,000 1,709,000 4 1,651,000 3 1,778,000 2 1,8970001(this week) 2003,000 2,088,000 1,970,000 1,925,000