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 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.

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Presentation on theme: " 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."— Presentation transcript:

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3  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.

4  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

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

6 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

7 Accuracy vs Precision Precise, not accurate Accurate, not precise Precise and accurate Groupings

8 Accuracy vs. Precision More Precise More AccurateLess Accurate x Less Precise

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10 High Accuracy High Precision Low Accuracy

11 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?

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14 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?

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

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