SEND TO THE EXPERT AND PLEASE SOLVE THIS PROBLEM WITH CORRECT ANSWERS STEP BY STEP:

Two independent methods of forecasting based on judgment and experience have been prepared each month for the past $10$ months. The forecasts and actual sales are as follows:

Month Sales Forecast $1$ Forecast $2$

$1840840805$

$2835830815$

$3840795835$

$4825785845$

$5770805795$

$6835795771$

$7805785790$

$8840780850$

$9810815845$

$10805825860$

$1.$ Compute the MSE and MAD for each forecast.

$2.$Compute MAPE for each forecast.

$3.$ Prepare a naive forecast for periods

$2$ through $11$ using the given sales data. Compute each of the following;

$-$MSE

$-$MAD

$-$Tracking signal at month $10$

$-2$s control limits