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Percent Error

Percent Error. Alex Rhoads Jim Jurgielewicz. What is Percent Error?. Percent Error measures the accuracy of an experiment. Percent Error was devised to find how close your experiment came to equaling the accepted value. Accepted Values.

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Percent Error

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  1. Percent Error Alex Rhoads Jim Jurgielewicz

  2. What is Percent Error? • Percent Error measures the accuracy of an experiment. • Percent Error was devised to find how close your experiment came to equaling the accepted value.

  3. Accepted Values • In every percent error problem, you are given an accepted value, also known as actual values, for the experiment. • This accepted value becomes the denominator in your Percent Error equation.

  4. For instance: The accepted value for 1 foot is 12 inches, but when you measure it you find it to be only 11.5 inches. The 12 inches is the accepted value and you must find the percentage of error in your findings. Accepted Values Cont’d

  5. The length between bases on a baseball field is known to be 90 ft. When measured by a group of students, they found the length to be 87 ft. What is the accepted value? A.) 87 ft. B.) 3 ft. C.)90 ft. D.) -3 ft. Example

  6. Incorrect • Sorry, you got the wrong answer. • Click on the following link to review accepted values. Accepted Value

  7. Congratulations! • You’re Correct • Advance to the next slide to learn about using the Percent Error Formula

  8. Formula for Percent Error • The Formula for Percent Error is:

  9. Formula Cont’d • This formula can be used for all kinds of experiments in order to see how quantitative your experiment was conducted Back to Example #1 Back to Example #2 Back to Example #3

  10. After finishing an experiment, John finds that the mass of a brick he weighed was 33.4 grams. Mr. Wolfe says that his accepted value for the mass was 32.7 grams. What was John’s percent error? A.) 66.1% B.) 2.14% C.) 0.7% D.) .0214% Example #1

  11. Incorrect • Sorry, you got the wrong answer. • Click on the following link to review the percent error formula. Percent Error Formula

  12. Good Job! • Nice work, you got it right • Continue on to the next example. Example 2

  13. Mr. Wolfe tells you that the accepted value of NaCl produced in a reaction is 23.7 grams. You find that there are 29.2 grams produced in your experiment. What is your percent error? A.) 23.2% B.) 81.4% C.) .188% D.) 18.8% Example #2

  14. Incorrect • Sorry, you found the wrong answer. • Click on the following link to review how to find percent error. Review Percent Error

  15. Nice Job • Congratulations, you got it right! • Go on to the third and final example Example 3

  16. While conducting an experiment in Mr. Weiss’ class, he tells you that acceleration due to gravity is 9.8 m/s2. After your experimentation, you find it to be 12.4 m/s2. What is your Percent Error? A.) .0265% B.) 26.5% C.) 265% D.) 7% Example #3

  17. Incorrect  • Sorry, you got the wrong answer. • Please return to Example 3 to try again. Example 3

  18. Correctamundo • Congratulations, you got the right answer. • You’ve successfully mastered the art of Percent Error. • Proceed to the next slide to review what you’ve learned. Review

  19. Percent Error Review • Percent Error finds the amount that a conducted experiment strayed from the accepted value. • The formula for this is:

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