# Accuracy & Precision

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.

How do they compare? Both accurate and precise

Precise but not accurate Neither accurate nor precise

Can you define accuracy vs. precision? Exit Quiz: Evaluate whether the following are precise, accurate or both. Low Accuracy Low Accuracy

High Accuracy Low Precision High Precision High

GOLF Accuracy and Precision Video Brain Pop

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