Posted by **Alyssa** on Thursday, October 11, 2007 at 11:45pm.

Say you made three different mass measurements of a sugar cube. You know the mass is 1.0g. how would you know whether or not the measurements were accurate? Precise?

- chemistry -
**DrBob222**, Friday, October 12, 2007 at 12:00am
Suppose you weighed the cube and obtained the following:

0.50 g; 1.0 g; 1.50 g

The average is 1.00 g; therefore, the accuracy is very good but the precision is lousy.

Suppose you weighed the cube and obtained the following:

0.50 g; 0.51 g; 0.49 g.

The average is 0.50 g which is far from the actual value of 1.0 g; therefore, the accuracy is lousy but the precision is good.

Suppose the weighings were as follows:

0.50 g; 0.60 g; 0.70 g.

The accuracy is not good (its a long way to 1.0 g) AND the precision is not good either.

The fourth case is the last possibility.

0.99 g; 1.0 g; 1.1 g.

The average is 1.0 g; therefore, the accuracy is very good and the precision is very good.

## Answer This Question

## Related Questions

- Science - A student measures the mass of a paper clip. The student’s data table ...
- Science - A student measures the mass of a paper clip. The student’s data table ...
- Science - A student measures a rectangular room to be 20.0 m X 17.16 m. Which of...
- Science- Ms. Sue or DrBob222? - A student measures a rectangular room to be 20.0...
- Physics - HI! :( Im sorry to bother you guys but I need help on only these three...
- Chemistry - Three people weigh on a standard mass of 2.00 g on the same balance...
- chemistry - Every measurement has a measurement uncertainty. Discuss how precise...
- chemistry - would this be true, false, or sometimes tru 1)An answear to ...
- accurate/precise - Can a set of measurements be precise but not accurate? ...
- chemistry - The density of sample measurements taken by a tech are: 0.810g/mL, 1...

More Related Questions