Analysis: (b) and (c) are precise, (a) and (d) are not. (a) and (c) are accurate, (b) and (d) are not.
a. Measurement accuracy.
b. Instrument accuracy.
c. Measurement error. d. Precision.
Analysis:
a) This term and instrument accuracy are used interchangeably if only one instrument is involved and if the measurement method is appropriate. Basically, the accuracy of the measurement is given by the instrument’s specifications (ordinarily in terms of percent of indicated value or full scale value).
b) See answer to part a).
c) Measurement error can be synonymous with measurement accuracy, but can also refer to sloppy methods of data acquisition, use of multiple transducers and/or instruments whose individual errors combine, or simply a lack of reliable, multiple data points.
d) Precision and resolution are interchangeable terms and refer to the smallest increment of measured quantity that can be detected by the instrument.
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