Problem $3-19($Algo$)$

Harlen Industries has a simple forecasting model: Take the actual demand for the same month last year and divide that by the number

of fractional weeks in that month. This gives the average weekly demand for that month. This weekly average is used as the weekly

forecast for the same month this year. This technique was used to forecast eight weeks for this year, which are shown in the following

tables along with the actual demand that occurred.

The following eight weeks show the forecast $($based on last year$)$ and the demand that actually occurred:

a$.$ Compute the MAD of forecast errors.

Note: Round your answers to $2$ decimal places.

b$.$ Using the RSFE, compute the tracking signal.

Note: Round your answers to $2$ decimal places. Negatlve values should be lndlcated by a minus sign.