Please provide a detailed answer showing all steps involved, formulas, and all parts of the question solved without using CHATGPT.

For a given time series of sales, the training set consists of 50 months. The first five months'data isshowninthe followingtable:

Month	Sales	SimpleExponential	Error
October19	27
November19	31
December19	58
January20	63
February 20	59

A) Computethesalesforecast forJanuary20andFebruary 20basedona simpleexponential method with w= 4. Provide your answers in the table above and show calculations.

B) Compute theforecast errorfortheabove forecast.Provideyouranswers inthetable.

SimpleExponentialForecastingattimet+1:

F_t+1= A_t+(1- ) F_t