Accuracy vs. Precision

Accuracy vs. Precision

Chemistry Notes

Multiple Choice

Accuracy is how close you are to the _______ value

• reproducibility of the value

• true

• fake

• measurement

Multiple Choice

Describe the accuracy and precision of the image

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

Multiple Choice

?

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

Multiple Choice

This bullseye demonstrates...

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

Multiple Choice

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

• Accuracy
• Precision
• Error
• Extrapolation

Accurate and Precise Data

Watch the following video up to 2:30 minute mark . Think about how the dart analogy helps us explain if our data is accurate or precise

• Suppose a quality control chemist at a pharmaceutical company is tasked with checking the accuracy and precision of three different machines that are meant to dispense 10 ounces (296 mL) of cough syrup into storage bottles. She proceeds to use each machine to fill five bottles and then carefully determines the actual volume dispensed.

• Which Dispenser has both accurate and precise volumes?

Dispenser #3

Dispenser #3 is working well, dispensing cough syrup both accurately and precisely.

Dispenser #1 is precise but not accurate

Dispenser #2 has improved accuracy but worse precision

Multiple Choice

• Student A
• Student B
• Student C
• Cannot be determined

Multiple Choice

• Student A
• Student B
• Student C
• Cannot be determined