M1.3_Accuracy and Precision

1. What is the difference between accuracy and precision in measurements?

• Accuracy is about the number of significant figures; precision is about the measurement units used.
• Accuracy is the number of measurements taken; precision is the time taken to measure.
• Accuracy is about closeness to the true value; precision is about consistency of measurements.
• Accuracy measures the average of measurements; precision measures the range of values.

What is the most common source of error when reading measurements from a graduated cylinder?

• Measurement from a ruler
• Using a non-calibrated cylinder
• Reading the measurement in dim light
• Parallax error

If multiple measurements of an object’s mass give nearly identical results but differ significantly from the true value, what can be said about these measurements?

• The measurements are precise but not accurate.
• The measurements are accurate but not precise.
• The measurements are both accurate and precise.
• The measurements are neither accurate nor precise.

It is a measure of how close measurements come to each other when they are made in the same way

• Accuracy
• Precision
• Error
• Extrapolation

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

• Accuracy

• Precision

• Significant

• Estimate

This bullseye demonstrates...

• High Accuracy & High Precision
• High Accuracy & Low Precision
• Low Accuracy & High Precision
• Low Accuracy & Low Precision

?

• High Accuracy & High Precision
• High Accuracy & Low Precision
• Low Accuracy & High Precision
• Low Accuracy & Low Precision

Describe the accuracy and precision of the image

• Accurate and Precise
• Accurate and not precise
• Not Accurate and Precise
• not accurate and not precise

If a measurement is accurate but not precise, what does it mean?

• The measurement is far from the true value and lacks consistency or repeatability.

• The measurement is close to the true value and has consistency or repeatability.

• The measurement is close to the true value but lacks accuracy.

• The measurement is close to the true value but lacks consistency or repeatability.

If a measurement is precise but not accurate, what does it mean?

• The measurement is close to the true or target value, but not consistent or reproducible.

• The measurement is close to the true or target value, but not precise or reproducible.

• The measurement is neither close to the true or target value, nor consistent or reproducible.

• The measurement is consistent and reproducible, but not close to the true or target value.