We have a monthly sales volume of Widget by Widgetaire for three years (36 months). Using a simple exponential smoothing method, we need to compute the 95% prediction interval of the forecasts for January, February, and March of year 4 (periods 37, 38, and 39). Assume: standard deviation of error = 35.1 units, forecasted sales for all these periods are 340.6 units, the optimal alpha = 0.1, and z(0.025)= 1.96. 

What is the upper bound (UB) of the 95% prediction interval for February of year 4

What is the upper bound (UB) of the 95% prediction interval for March of year 4

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