複選題3. Which of the following analytical statistics statements is (are) correct?
(AB) A user repetitively reading the volume marking on the pipet from an angle rather than at eye level causes random error.
(AC)Random error causes data to be scattered more or less symmetrically around a mean value.
(AD) The relative error of a measurement is the difference between the measured value and the true value divided by the standard
deviation.
(AE) Systematic method errors can be decided by application of the method to the analysis of a standard reference material having one or more analytes at known concentration levels.
(BC) The mean is the middle result when replicate data are arranged according to increasing or decreasing value.
(BD) Proportional systematic errors can be detected by varying the sample size.
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