Accuracy and Precision

Define Accuracy.

• Accuracy is the closeness of a measured value to a standard or true value.
• Accuracy is the difference between measured values.
• Accuracy refers to the speed of measurement.
• Accuracy is the average of all measured values.

Accuracy is based and calibrated off _________.

• know measurements

• a statistical average
• a random guess
• a personal opinion

Define Precision.

• Precision is the range of values in a dataset.
• Precision is the consistency of repeated measurements.
• Precision refers to the accuracy of a single measurement.
• Precision is the average of all measurements.

True or False: Measurements can be accurate but not precise.

• False.

• True

True or False: Measurements can be precise but not accurate.

• True

• False

What does the accuracy and precision determine of a measurement?

• Accuracy and precision measure the temperature of a substance.
• Accuracy and precision indicate the color of a measurement.
• Accuracy and precision determine the speed of a process.
• Accuracy and precision determine the uncertainty of a measurement.

What does uncertainty in a measurement describe?

• The method used to take the measurement.
• How much your measured value deviates from the actual value.

• The average of all measurements taken.
• The exact value of a measurement.

True or False: All measurements contain uncertainty.

• True

• False

How many factors contribute to uncertainty?

• Five factors contribute to uncertainty.
• Three factors contribute to uncertainty.
• Four factors contribute to uncertainty.
• Two factors contribute to uncertainty.

What is the percent uncertainty equation?

• (measured value / absolute uncertainty) * 100%
• (absolute uncertainty / measured value) * 100%
• (absolute uncertainty * measured value) / 100%
• (measured value + absolute uncertainty) * 100%