You are at the end of November and you want to forecast sales for December. What kind of information can you find in the text? You are at the end of November: meaning t=November You want to forecast sales for December: t 1=December and you are interested in Ft 1. "...the trend analysis through October has been 10 additional gallons of product sold per month.", meaning: October = t-1 so that Tt-1=10 "...The average level estimated from the demands up to October have been 60 gallons per month.", meaning: the level L t-1=60. "...The demand for November was 68 gallons.", meaning: Dt=68. The smoothing parameters are alpha=0.2 (level) and beta=0.1 (trend)

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To forecast sales for December Ft1 you can use the HoltWinters method with expon... View the full answer