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Accuracy vs. Precision

Accuracy vs. Precision. In Science we want measurements to be both accurate & precise. What is the difference between these two?. Accuracy is a measure of rightness. Precision is a measure of exactness. Accuracy vs. Precision.

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Accuracy vs. Precision

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  1. Accuracy vs. Precision In Science we want measurements to be both accurate & precise. What is the difference between these two?

  2. Accuracy is a measure of rightness.Precision is a measure of exactness.

  3. Accuracy vs. Precision • Accurate means "capable of providing a correct reading or measurement." A measurement is accurate if it correctly reflects the size of the thing being measured. • Precise means “repeatable, reliable, getting the same measurement each time.”

  4. Consider these images…

  5. Accuracy vs. Precision • Accuracy refers to how closely a measured value agrees with the correct value. • Precision refers to how closely individual measurements agree with each other.

  6. Accuracy vs. Precision • Accurate but not precise. • The average is close to the center but the individual values are not similar

  7. Accuracy vs. Precision • Precise, but not accurate

  8. Accuracy vs. Precision • Accurate AND precise! • This is the goal of data collection in science.

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