$4\mathrm{.}1$ Collect historical demand data for a product$/$service and fit the following forecasting models and calculate forecasting errors, ABS, MAD, bias, and std$.$ dev. $(20$ Points$)$

$$ Moving Average

$$ Exponential Smoothing

$$ Exponential Smoothing with Trend

$$ Exponential Smoothing with Trend and Seasonality

Please submit the Excel spreadsheet, including the data you collected and evidence of the analyses your team has done.

$4\mathrm{.}2$ Which forecasting model do you recommend? Explain why. $(5$ Points$)$