# quiz mx

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1. errors that occur in testing process may be either
• random
• systematic
2. only a cause for rejection of the test run if it exceeds +2SD
random error
3. error is not acceptable, as it indicates some failure in the system that can and should be corrected
systematic error
4. examples of systematic error
• shift
• trend
5. when the control is on the same side of the mean for five consecutive runs
shift
6. when the control is moving in one direction, and appears to be heading toward an out of control value
trend
7. can help distinguish between normal variation and systematic error
levey-jennings charts
8. in most situations, measurement uncertainty is estimated at
95% coverage
9. for most instances, a range of ___ is accepted as measurement uncertainty that is explained by random variation
± 2SD
10. when QC sample that is used in a test run is out of the acceptable range, the run is considered to be ___________
out of control
11. the closeness of a measurement to its true value
accuracy
12. the amount of variation in the measurements
precision
13. the difference between the expectation of a test result and an acceptable reference method
bias
14. the reliability of a method is judged in terms of
accuracy and precision
15. to determine acceptable variation, the laboratory must compute the SD of the ___ values
20
16. ____ of the values will fall within -1SD and +1SD of the mean
68.3%
17. ____ of the values will fall within -2SD and +2SD of the mean
95.5%
18. ____ of the values will fall within -3SD and +3SD of the mean
99.7%
19. the measurement of variation in a set of results
standard deviation (SD)
20. formula : SD
21. when only one control is used, we consider an examination run to be __ if a value is within 2SD of the mean
in control
22. the SD expressed as a percentage of the mean
coefficient of variation (CV)
23. formula CV
• CV (%) = SD x 100
•               ------
•               Mean
24. used to monitor precision
CV
25. ideally, the value of CV should be
less than 5%
26. westgard rule was developed by
James Westgard
27. multirule system requires running two controls (or 3 controls) of different target values for each set of examinations, developing a Levey-Jennings chart for each, and applying the rules
Westgard Rules
28. represent the range graphically for purpose of daily monitoring
Levey-Jennings Chart
29. another set of rules used to avoid rejecting runs that may be acceptable
Westgard Rule

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 Author: Anonymous ID: 335819 Filename: quiz mx Updated: 2017-11-08 15:01:37 Tags: mx Folders: mx Description: midterms Show Answers:

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