Accuracy & Precision.

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Presentation transcript:

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

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?

Exit Quiz: Evaluate whether the following are precise, accurate or both. High Accuracy High Precision Low Accuracy Low Precision Low Accuracy High Precision

GOLF

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