This lab is designed to have you make and record measurements and then to use that recorded data to assess how reliable the instruments are. More specifically, you will make measurements of a speeding cow using 5 different officers. Each of these officers has a different amount of random and systematic error that has been programmed into their radar guns. This means that each measurment of the speeding cow will be different than the previous measurement. Your task is to determine who is the good cop and who is the bad cop and to explain your choices based on the data that you acquired.

1. Open the simulation by clicking the link above if you have not already done so
2. Make all measurements at 60 mph, which is the true velocity of the cow.
3. Make 10 measurements per officer but only use the first 5 officers that are listed
4. Compute the average speed measured per officer and record it in the worksheet
5. Record all your results and answers using the Lab Notebook link

1. Using the data you have taken, identify whom you think is the good cop.
2. Now who is the bad cop (the one that would likely write the most tickets)
3. Finally, which cop has the most unreliable radar gun?

In each case, justify your choice based on the data that you have taken.

In the launcher that you just activated click once on the "untitled" worksheet to open it. That will be your worksheet that you use to record the data. When done, submit your worksheet by clicking on the words "publish to global view" (the first item under reporting tasks).