Errors in chemical analysis Flashcards
1
Q
several possible sources. Readings all too high or too low. Affects accuracy
A
systematic error/determinate error
2
Q
data scattered approx. systematically about a mean value. Affects precision
A
Random error/indeterminate error
3
Q
sources of systematic error
A
instrumental error
personal error
methodic error
4
Q
absolute error =
A
measured value - true value
5
Q
relative error =
A
absolute error/true value
6
Q
affect precision
A
systematic errors
7
Q
affect accuracy
A
random errors
8
Q
result from uncontrolled variables in an experiment. They are treated statistically and follow a Gaussian distribution
A
Random errors
9
Q
result from a particular cause and can usually be determined
A
Systematic error
