Chapter 05 - Fundamentals of Analytical Chemistry 9th ed Chapter 5 Chapter 5 5-1(a Random error causes data to be scattered more or less symmetrically

Chapter 05 - Fundamentals of Analytical Chemistry 9th ed...

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Fundamentals of Analytical Chemistry: 9 th ed. Chapter 5 Chapter 5 5-1 . (a) Random error causes data to be scattered more or less symmetrically around a mean value while systematic error causes the mean of a data set to differ from the accepted value. (b) The magnitude of a constant error stays essentially the same as the size of the quantity measured is varied while proportional errors increase or decrease according to the size of the sample taken for analysis. (c) The absolute error of a measurement is the difference between the measured value and the true value while the relative error is the absolute error divided by the true value. (d) The mean of a data set is obtained by dividing the sum of replicate measurements by the number of measurements in the set while the median is the middle result when replicate data are arranged according to increasing or decreasing value. 5-2. (1) Meter stick slightly longer or shorter than 1.0 m – systematic error.
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