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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > January  >
In the Laboratory
Effect of Sample Size on Sampling Error: An Experiment for Introductory Analytical Chemistry
Joseph E. Vitt and Royce C. Engstrom
Department of Chemistry, University of South Dakota, Vermillion, SD 57069
Cover
January 1999
Vol. 76 No. 1
p. 99
Abstract
Despite the importance of sampling in analytical chemistry, it is frequently overlooked in the introductory analytical curriculum. We have developed a laboratory experiment suitable for the introductory analytical course that introduces the principles of sampling and statistical treatment of data. The students acquire samples of various size from a binary population, calculate the relative standard deviations for each sample size, and compare these results with those predicted by the binomial distribution. This experiment gives excellent agreement for the pooled student data, and the results show the expected decrease in sampling error as the sample size increases.
Supplement
The experiment can be accessed as a pdf document (Adobe Acrobat) or three Microsoft Word documents. The Microsoft Word documents have been compressed into a zip file (for Windows) and a sit file (for Macintosh).
*  Contents
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supp99.pdf

supp99.sit

supp99.zip
More Information
*  Citation
 Vitt, Joseph E.; Engstrom, Royce C. J. Chem. Educ. 1999 76 99.
*  Keywords
 Laboratory Instruction; Quantitative Analysis; Instrumental Methods; Analytical Chemistry
*  History
 Created:
Last Updated:		 June 15, 1999
November 22, 2005
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