Accuracy and precision are important concepts, as they relate to any experimental measurement that you would make.

**Accuracy**

Accuracy refers to the agreement between experimental data and a known value. You can think of it in terms of a bullseye in which the target is hit close to the center, yet the marks in the target aren't necessarily close to each other.

**Precision**

Precision refers to how well experimental values agree with each other. If you hit a bullseye precisely, then you are able to hit the same spot on the target each time, even though that spot may be distant from the center.

**Keep in Mind**

Data can be very precise such that each data point is close to the others, yet contain a high degree of experimental error.

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