Question 15 If a counter of the parts in the system goes from 20 to 21, this is an indication of what of the following events: The arrival of a part A departure of a part The end of the simulation A decrease in the average parts in queue Question 16 What is the importance of statistical accumulators? They allow us to keep track of the performance level of the process They are inconsequential to our process They are gathered only at the beginning of the process We do not care about them