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# Accuracy and Precision

## Data that is close to a measured value versus data that is grouped closely together.

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Practice Accuracy and Precision

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Feeding the Ducks

### How do accuracy and precision affect scientific experiments?

Credit: Little Mountain 5
Source: http://commons.wikimedia.org/wiki/File:Duck_Yosemite.jpg

[Figure1]

Accuracy and precision are both vital components to a successful scientific experiment.

It’s a lovely day out and you decide to go to the duck pond. You bring a loaf of bread, break it up into little pieces, and begin to throw it at a duck. The first throw hits the duck’s beak. The second throw lands a few feet to the left of the duck. The third throw lands a few feet to the right of the duck.

### Creative Applications

1. How accurate were each of your throws?
2. How precise were your three throws combined?
3. You decide to give the duck more bread and throw out 3 more pieces. All of them land an inch away from the duck’s beak. How precise and accurate were your throws?
4. Finally you try one more time and throw out 3 more pieces. All of them land right in front of the duck’s beak. How precise and accurate were your throws?
5. How can you relate this to a chemistry experiment? Why is it important to have controlled experiments?
6. Make a conclusion. What exactly does accuracy mean? How about precision? How are they similar and how are they different?

### Notes/Highlights Having trouble? Report an issue.

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