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AccuracyPrecision.ppt

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The document discusses the differences between accuracy and precision. Accuracy refers to how close a measurement is to the true value, while precision refers to how close repeated measurements are to each other. Examples are provided to illustrate the differences, such as measuring the length of a book. Precision is determined by how close repeated measurements are, while accuracy compares the measurements to the true length. The concepts are also demonstrated using diagrams of targets with arrows to represent measurements.

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Accuracy & Precision
Accuracy Accuracy Compares a measurement to the true value .
Example: Accuracy Who is more accurate when measuring a book that has a true length of 17.0 cm? Susan: 17.0 cm, 16.0 cm, 18.0 cm, 15.0 cm Amy: 15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm
Precision Precision = describes how closely measurements are to each other and how carefully measurements were made Which set is more precise? 18.2 , 18.4 , 18.35 17.9 , 18.3 , 18.85 16.8 , 17.2 , 19.44
Example: Precision Who is more precise when measuring the same 17.0 cm book? Susan: 17.0 cm, 16.0 cm, 18.0 cm, 15.0 cm Amy: 15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm
Accuracy vs. Precision High Accuracy High Precision High Precision Low Accuracy
Three targets with three arrows each to shoot. Can you hit the bull's-eye? Both accurate and precise Precise but not accurate Neither accurate nor precise How do they compare? Can you define accuracy vs. precision?
Exit Quiz: Evaluate whether the following are precise, accurate or both. Low Accuracy Low Precision Low Accuracy High Precision High Accuracy High
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AccuracyPrecision.ppt

  • 2. Accuracy Accuracy Compares a measurement to the true value .
  • 3. Example: Accuracy Who is more accurate when measuring a book that has a true length of 17.0 cm? Susan: 17.0 cm, 16.0 cm, 18.0 cm, 15.0 cm Amy: 15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm
  • 4. Precision Precision = describes how closely measurements are to each other and how carefully measurements were made Which set is more precise? 18.2 , 18.4 , 18.35 17.9 , 18.3 , 18.85 16.8 , 17.2 , 19.44
  • 5. Example: Precision Who is more precise when measuring the same 17.0 cm book? Susan: 17.0 cm, 16.0 cm, 18.0 cm, 15.0 cm Amy: 15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm
  • 6. Accuracy vs. Precision High Accuracy High Precision High Precision Low Accuracy
  • 7. Three targets with three arrows each to shoot. Can you hit the bull's-eye? Both accurate and precise Precise but not accurate Neither accurate nor precise How do they compare? Can you define accuracy vs. precision?
  • 8. Exit Quiz: Evaluate whether the following are precise, accurate or both. Low Accuracy Low Precision Low Accuracy High Precision High Accuracy High