1. The Sandbox Task

2. Andrew and Ivy are organizing the lab
Andrew and Ivy are organizing the lab. Andrew leaves his pen in a pile of papers here (location 1) and then goes to get a coffee X
Location 1

3. While Andrew is out of the room, Ivy takes his pen and places it in the papers here (location 2).X X
Location 2
Location 1

4. While Andrew is out of the room, Ivy takes his pen and places it in the papers here (location 2)X X X
Location 2
Location 1
My Answer

5. Measuring Your Bias Score
The General Concept
Measure the distance from your answer to location 1 (in mm). This measurement will indicate your bias.
This measurement will either have a positive or negative sign associated with it

6. The following slides will help you determine if your measurement is positive or negative

7. Measuring Your Bias Score
Possible Responses
If your response is towards location 2 and away from location 1, your answer is positive

8. Where will Andrew look for his pen when he gets back?
Positive Bias
Where will Andrew look for his pen when he gets back?
+10mm X X X
Location 2
Location 1
My Answer

9. Measuring Your Bias Score
Possible Responses
If your response is towards location 2 and away from location 1 and overshoots location 2, your answer is positive

10. Where will Andrew look for his pen when he gets back?
Positive Bias
Where will Andrew look for his pen when he gets back?
+25mm X X X
Location 1
Location 2
My Answer

11. Possible Responses
If your response is away from location 1 and away from location 2, your answer is negative

12. Where will Andrew look for his pen when he gets back?
Negative Bias
Where will Andrew look for his pen when he gets back?
-1mm X X X
Location 1
Location 2
My Answer

13. No Bias Possible Responses
If your response is at the exact same spot as location 1, your answer is 0

14. Where will Andrew look for his pen when he gets back?
No Bias
Where will Andrew look for his pen when he gets back?
0 mm X X X
Location 1
Location 2
My Answer

15. The following slides will help you determine the magnitude of your bias (the distance between your answer and the correct location).

16. Bias Calculation
In order to calculate the bias score you will have to perform a few measurements and some simple subtraction

17. Bias Calculation Example 1
15mm X X X
Location 2
Location 1
My Answer

18. Bias Calculation Example 1
15mm
5mm X X X
Location 2
Location 1
My Answer

19. Bias Calculation Example 1
15mm
Unknown
5mm X X X
Location 2
Location 1
My Answer

20. Bias Calculation Example 1
15mm
15-5=Unknown
Unknown
5mm X X X
Location 2
Location 1
My Answer

21. Bias Calculation Example 2
15mm X X X
Location 2
Location 1
My Answer

22. Bias Calculation Example 2
15mm
12mm X X X
Location 2
Location 1
My Answer

23. Bias Calculation Example 2
15mm
Unknown
12mm X X X
Location 2
Location 1
My Answer

24. Bias Calculation Example 2
15mm
Unknown
15-12 = unknown
12mm X X X
Location 2
Location 1
My Answer