Problem $672602$:

Do not include anything other than numbers in your responses. For example, do not include comma or dollar sign in your numbers. As a rule of thumb, keep $2$

decimal places for larger numbers and $3$ decimal places for smaller numbers less than $1.$

Consider the following data. We want to monitor the forecasts.

Also, we want to monitor the forecasts using tracking signals with control limits of $+-4$ MADs.

Answer the following related questions:

Below fill in the blanks $($cumulative errors, MADs, and tracking signals of periods $3,4$ and $5).$

Keep two decimal places in your calculations.

Based on tracking signals of period $4$ and $5,$ are the forecasts biased? $($Yes$/$No$)$