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Accuracy & Precision
Chemistry intro to accuracy and precision
Term | Definition |
---|---|
The agreement between actual value and that obtained from an experiment is a measure of the ___________________ of the data. | accuracy |
Which measurement is more precise? 53.7 cm, 31.77 cm, 12 cm | 31.77 cm |
Liters are a measurement of this quantity | volume |
This presents infomation in rows and columns making it easier to read and understand | a data table |
International systems of units related by multiples of ten designed to provide a world wide standard of physical measurement | metric (or SI) system |
Describes how closely measurement are to each other and how carefully measurements were made | precision |
This is the Si and metric base unit for length | meter |
This is the amount of matter in an object is its | mass |
This is a type of graph used to show the relationship between two variables that are numbers on an x axis and y axis | line graph |
This is the metric base unit for mass | g |
This is the metric base unit for temperature | Celsius |
This is used to collect organized and summarize data in a visual way making it easy to use and understand | graph |
Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of exactly 7.32 g for the mass of the standard. These results imply that the balance that was used is:accurate, precise, both, or neither? | precise but not accurate |
Given the following set of measurements: 6.75 kg, 6.80 kg and 6.85 kg, if the true value is 6.80 kg, are the measurements accurate, precise, both, or neither? | accurate and precise |
True or False: If a measurement is precise, it must also be accurate. | false |
Kami measured the volume of a liquid three times and got these results: 66.71 mL, 66.70 mL, 66.69 mL. The actual volume of the liquid is 69.70 mL. Was she accurate? | no |
A basketball player shoots once and gets "nothin' but net". Was she accurate, precise, both, or neither? | accurate, but not precise because she only tried once. |
This is also called called reproducibility or repeatability. | precision |