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Effect of Sample Size on Sampling Error: An Experiment for Introductory Analytical Chemistry
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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.
Keywords (Audience):
High School / Introductory ChemistryKeywords (Domain):
Laboratory InstructionKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Quantitative AnalysisCiting Articles
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This article has been cited by 4 ACS Journal articles (4 most recent appear below).
A Laboratory Exercise To Demonstrate the Theory and Practice of Analytical Sampling
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Michael A. JeannotJournal of Chemical Education2006 83 (2), 243A novel laboratory activity in sampling statistics, suitable for students in a quantitative analysis course, is described. In this activity, students measure the percentage of iron in a commercial lawn fertilizer by simple sorting and weighing. The pooled ...
A Demonstration of Sample Segregation
Mark D. Fritz , Stephen B. Brumbach , JudithAnn R. HartmanJournal of Chemical Education2005 82 (2), 255A Demonstration of Sample Segregation
Mark D. Fritz , Stephen B. Brumbach , JudithAnn R. HartmanJournal of Chemical Education2005 82 (2), 255Handling a solid mixture can segregate its particles by size. A simple, visually-compelling demonstration shows students how stirring or pouring can segregate a mixture and create a nonuniform sample. The demonstration uses colored beads and other ...
Two Experiments Illustrating the Importance of Sampling in a Quantitative Chemical Analysis
David HarveyJournal of Chemical Education2002 79 (3), 360Two Experiments Illustrating the Importance of Sampling in a Quantitative Chemical Analysis
David HarveyJournal of Chemical Education2002 79 (3), 360With many instructors of quantitative analysis courses emphasizing the analysis of "real-world" samples, there is a need for more experiments illustrating the importance of sampling as a source of uncertainty. Unfortunately, the few available experiments ...
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- Received: August 03, 2009
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