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IB Chem IA terms

e: IB Chem IA terms

QuestionAnswer
Random error error that is above and below true value, usually due to limitations of equipment
Systematic error error that is consistently in one direction, usually due to instrument or usually a method error
Precision a measure of the certainty (±)
Accuracy how close the value is to the accepted value
Absolute uncertainty the ± value in a reading
Percentage uncertainty the ± value in a reading divided by the reading
Absolute error measured value less accepted value
Percentage error measured value less accepted value all divided by accepted value
Reliability judgement of if the data can be repeated with the method given
Validity judgement of if the experiment is testing for what the RQ is stating it is testing for
Absolute uncertainty of the mean The range of a trial divided by the number of trials. Statistical measure of uncertainty.
Instrument uncertainty The calculation of uncertainty for a trial based on the limits of the instrumentation.
Percent difference Calculation used to determine anomalous results. % difference = (value-mean)/mean
Created by: andrewweng0406
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