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By James Miller, Jane C Miller

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Extra resources for Statistics and Chemometrics for Analytical Chemistry

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Most analytical scientists have their own PCs on their desks and portable PCs facilitate the recording and calculation of data in the field. Many laboratory instruments are now devoid of manual controls, being entirely controlled by a linked PC which in turn handles and reports the data obtained. g. of digitized spectra) and comparing analytical data with the databases, optimizing operating conditions (see Chapter 7), and selecting and using a variety of calibration calculations. One concern is that the software provided with computer-controlled instruments is not always explained to the user: there is a risk of having a data set interpreted via (for example) a calibration routine which is not defined and might not always be appropriate.

6 The sampling distribution of the mean, showing the range within which 95% of sample means lie. 7% confidence limits. 8) where the value of z depends on the degree of confidence required. 1. 0165 and n = 50. 506. 7 Confidence limits of the mean for small samples As the sample size gets smaller, s becomes less reliable as an estimate of σ. 2 as a sample of size five. 018. We see that the largest value of s is nearly three times the size of the smallest. 8) must be modified. 9) . f. (usually given the symbol ν).

Express this as a relative standard deviation. Hence calculate the relative standard deviation of the molarity of the solution. Repeat the calculation for a reagent of formula weight 392. 1 × 10−10. Calculate the standard deviation of the calculated solubility of barium sulphate in water. 1 Page 39 Significance tests Introduction One of the most important properties of an analytical method is that it should be free from systematic error. This means that the value which it gives for the amount of the analyte should be the true value.

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