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Accuracy vs. Precision

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Accuracy Accuracy = the extent to which a measured value agrees with a standard value Accuracy of a device must be checked Does it read a proper accepted value? Beware of Parallax – the apparent shift in position when viewed at a different angle.

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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

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Precision Precision = the degree of exactness of a measurement that is repeatedly recorded. Which set is more precise? 18.2 , 18.4 , 18.35 17.9 , 18.3 , 18.85 16.8 , 17.2 , 19.44

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Example: Precision Who is more precise when measuring the same 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

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**Accuracy vs Precision Groupings Precise, not accurate**

Accurate, not precise Precise and accurate Groupings

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**Accuracy vs. Precision Less Precise More Precise More Accurate**

Less Accurate x

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Accuracy vs Precision

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**Accuracy vs. Precision High Accuracy High Precision**

High Precision Low Accuracy

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**Can you hit the bull's-eye?**

Three targets with three arrows each to shoot. Both accurate and precise Precise but not accurate Neither accurate nor precise How do they compare? Can you define accuracy vs. precision?

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**Graduated Cylinder – Meniscus and Parallax**

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**Why Is There Uncertainty?**

Measurements are performed with instruments, and no instrument can read to an infinite number of decimal places Which of the instruments below has the greatest uncertainty in measurement?

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**Evaluate whether the following are precise, accurate or both.**

High Accuracy High Precision Low Accuracy Low Precision Low Accuracy High Precision

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Accuracy vs Precision

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**ACCURACY VS. PRECISION GAME**

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