The Center Challenge

& Error Analysis

schmied/reid©2008 all rights reserved!

Please answer these questions on a separate sheet of paper using complete, quality & correct answers.

1. Completely explain the problem being solved in this investigation.

2. Create a complete, numbered list of all the materials needed to do this investigation.

3. Develop a numbered step by step procedure for the entire exercise, from:

(First step) = 1. Report to the Center.

. . . . . . list all the rest of the steps….

(Last step) = _#?_. Complete this write up CQC on a separate sheet of paper.

4. Data Table: Attach a CQC Data Table for the entire class's data. Ensure all data is properly totaled and averaged. Double Check all totals and averages

5. Error: Error is defined as the difference between the True Value and the Measured Value.

  • Use 396 meters as the True Value and compare each team's Measured Value to this value.
  • Calculate how far off all teams were in total length..Be sure to show your set up & math!
  • Enter values in Data Table & circle and Label the High and Low Values

The Formula is:   MV - TV = Error  (also Indicate either High or Low also please)

6. Accuracy: Accuracy is defined as absence of Error, or the close agreement between the True Value and the Measured Value.

  • Use 396 meters as the True Value and each team's Measured Value
  • Calculate the per cent accuracy for each team. Be sure to show one set up & math.
  • Enter values in Data Table & circle and Label the High and Low Values

The Formula is: % Accuracy = 100 [(measured value/true value) -1]

Use PEMDAS!

Note: A. a positive answer means your measurements were too high by that percentage.

B. A negative answer means your measurements were too low by that percentage

7. to 12. Error Analysis Section: Name and give an example of each type of error that did or could of occurred during this procedure. Be sure to use complete sentences and include the

Type of error: How each did or could have occurred.

7. Procedural Error

8. Observer Error

9. Operator Error

10. Measuring Tool Limitation

11. Recording Error

12. Calculation Error

13. Analyze the classes results. Tell/Explain:  Does the class data show a relationship between the length of the line and the amount of error a station had?

14. Revising Procedure: Knowing what you know now, explain 2 different ways you would change your procedure or your actions to make your measurements more accurate next time.

15. Key Differences: Explain why the Center Challenge was not an experiment. In other words, tell at least two key differences between an experiment and this exercise.

 

Scientific Method Index
Project Page

Home

© 2008 John Schmied & Mike Reid all rights reserved