Accuracy and Precision

What is precision in the context of measurements?

• The ability of a measurement to reflect the true value

• The consistency and repeatability of measurements

• The closeness of measurements to the actual value

• The degree of error in a measurement

What is accuracy in the context of measurements?

• The ability of a measurement to reflect the true value

• The consistency and repeatability of measurements

• The closeness of measurements to the actual value

• The degree of error in a measurement

Which of the following statements is true regarding precision and accuracy?

• A measurement can be precise but not accurate.

• A measurement can be accurate but not precise.

• Precision and accuracy are the same thing.

• Precision and accuracy are unrelated concepts.

If you repeatedly measure the length of an object and your measurements are very close to each other but consistently greater than the actual length, what can you say about the measurements?

• They are precise and accurate.

• They are precise but not accurate.

• They are accurate but not precise.

• They are neither precise nor accurate.

What is the term for the difference between a measured value and the true or accepted value?

• Precision

• Accuracy

• Error

• Uncertainty

If you want to improve the accuracy of your measurements, what should you focus on?

• Reducing random errors

• Increasing the number of measurements

• Using a more sensitive instrument

• Improving the precision of measurements

Which of the following statements about significant figures is correct?

• Significant figures indicate the precision of a measurement.

• Significant figures indicate the accuracy of a measurement.

• Significant figures are only used in scientific notation.

• Significant figures are unrelated to precision and accuracy.

Add and report the sum in the correct number of significant figures: 10.354 + 3.27 + 113.9

• 127

• 127.5

• 127.52

• 127.524

Multiply and report the product in the correct number of significant figures: 4087.32 x 112.3

• 459,006.036

• 4.59 x 10^4

• 4.59 x 10^5

• 4.590 x 10^5

What is 0.000523 in scientific notation?

• 523 x 10^-3

• 5.23 x 10^3

• 5.23 X 10^-4

• 523 x 10^4