Community Federal Bank in Dothan, Alabama, recently installed a new automatic teller machine to perform the standard banking services and handle loan applications and investment transactions. The new machine is a bit complicated to use, so management is interested in tracking its past use and projecting its future use. Additional machines may be needed if projected use is high enough.

At the end of April, the average monthly use was 600 customers and the trend was +60 customers per month. The actual us figures for May, June and July are 680,710, and 790 respectively. Use trend-adjusted exponential smoothing with α = 0.3 and β = 0.2 o forecast usage for June, July, and August.