Problem 672604: 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.

Period	Demand	Forecasts
1	52	--
2	62	61
3	59	61
4	53	68
5	58	65

Also, we want to monitor the forecasts using tracking signals with control limits of 4 MADs. Answer the following related questions:

A. Below fill in the blanks (cumulative errors, MADs, and tracking signals of periods 3, 4 and 5). Keep two decimal places in your calculations.

Period	Cumulate Errors	MADs	Tracking Signals
1	---	--	--
2	--	--	--
3
4
5

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