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:

MonthSalesForecast $1$Forecast $217717757762790790792379479579647767797805772772771677077377477617597568774774774979279179210794797794$

Compute a tracking signal for the $10$th month for each forecast using the cumulative error for months $1$ to $10.$ Use action limits of $4.$ Is there bias present?

Note: Do not round your intermediate calculations. Round your answers to $2$ decimal places. Negative amounts should be indicated by a minus sign.

Compute $2$s control limits for each forecast.

Note: Do not round your intermediate calculations. Round your answers to $2$ decimal places.