Accuracy, Precision, & Percent Error Review

How close a measurement is to the accepted value is called..

• Accuracy

• Precision

• Significant

• Estimate

When a measurement is repeatable and consistent it is said to have...

• High precision
• Low precision
• High accuracy
• Low accuracy

What does this bullseye demonstrate?

• High Accuracy & High Precision

• High Accuracy & Low Precision

• Low Accuracy & High Precision

• Low Accuracy & Low Precision

What does this bullseye demonstrate?

• High Accuracy & High Precision

• High Accuracy & Low Precision

• Low Accuracy & High Precision

• Low Accuracy & Low Precision

Students measured length during a science experiment and got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?

• 15.79%

• 18.75%

• 2.25%

• 18%

A zero percent error in a lab is accomplished by...

• having a really good measuring device

• making sure all the steps in a procedure are being followed

• getting the exact result as the expected result in a lab

• rounding numbers to zero

Students worked in teams to measure the length of an object. Their results are listed below. The actual length of the object was 7.0 cm. Select the best choice that represents their data in terms of accuracy and precision

GROUP RESULTS

5.00 cm

5.01 cm

5.02cm

4.99 cm

5.00 cm

4.99 cm

• both accurate and precise

• only accurate

• only precise

• not accurate and not precise

What measurement are we finding when we use a graduated cylinder?

• mass
• volume
• length
• weight