Chem C127 Flashcards
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Chem C127 Flashcards
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15 Terms
systematic error
the measurements consistently wrong in the same way, there could be a problem with the instrument or measuring method
systematic error results in…
low accuracy
solution for systematic error
verify that the measurement tool reads the actual value correctly, calculate percent error
measurement error
random, inconsistent, scattered error, answers are all over the place.
high measurement error results in…
low precision
solution for measurement error
measure many samples and then take the average
accuracy
How close a measurement is to the true or correct value
high accuracy means…
the measured number(s) are close to the actual value
precision
How close/closely clustered repeated measurements are to each other
high precision means…
the measured numbers are close/clustered together (ex: you measure 9.1, 9, 8.9, 9.2)
low precision means…
the measured numbers are far apart (ex: you measure 5, 18, 30, and 1)
small standard deviation means…
measurements are clustered close together, closer to the average
large standard deviation means…
measurements are more spread out
which curve has the largest standard deviation?
C
which curve has the smallest/lowest standard deviation?
A