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A classroom exercise in sampling technique
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Abstract
Teaching about sampling problems leads to a very theoretical understanding of the difficulties encountered when selecting a representative sample. A classroom hands-on demonstration has been developed that looks at the two important sampling considerations, sample size and non-homogeneous sample materials. This classroom activity makes use of readily available MandM candies for the sample size and NERDS for the non-homogeneous sample exercises. Results from the past four years are given.
Keywords (Audience):
First-Year Undergraduate / GeneralKeywords (Domain):
Analytical ChemistryKeywords (Feature):
Tested DemonstrationsKeywords (Pedagogy):
Problem Solving / Decision MakingKeywords (Subject):
Quantitative AnalysisCiting Articles
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This article has been cited by 7 ACS Journal articles (5 most recent appear below).
A Laboratory Exercise To Demonstrate the Theory and Practice of Analytical Sampling
Brian A. Logue and Stephanie L. YousoJournal of Chemical Education2010 87 (3), 316-319A Laboratory Exercise To Demonstrate the Theory and Practice of Analytical Sampling
Brian A. Logue and Stephanie L. YousoJournal of Chemical Education2010 87 (3), 316-319In analytical chemistry classes, the importance of gathering a proper sample for analysis of bulk materials is often addressed only briefly or not at all. Although a number of classroom and laboratory exercises have been developed to illustrate factors ...
Using Candy Samples To Learn about Sampling Techniques and Statistical Data Evaluation
Larissa S. Canaes , Marcel L. Brancalion , Adriana V. Rossi and Susanne RathJournal of Chemical Education2008 85 (8), 1083Using Candy Samples To Learn about Sampling Techniques and Statistical Data Evaluation
Larissa S. Canaes , Marcel L. Brancalion , Adriana V. Rossi and Susanne RathJournal of Chemical Education2008 85 (8), 1083A classroom exercise for undergraduate and beginning graduate students that takes about one class period is proposed and discussed. It is an easy, interesting exercise that demonstrates important aspects of sampling techniques (sample amount, particle ...
A Spoonful of C12H22O11 Makes the Chemistry Go Down: Candy Motivations in the High School Chemistry Classroom
Fanny K. EnneverJournal of Chemical Education2007 84 (4), 615A Spoonful of C12H22O11 Makes the Chemistry Go Down: Candy Motivations in the High School Chemistry Classroom
Fanny K. EnneverJournal of Chemical Education2007 84 (4), 615For chemistry teaching that emphasizes connections to the observable world, sixteen quick motivations that involve food are described, spanning many topics in a high school chemistry curriculum: measurement, naming, stoichiometry, distillation, periodic ...
Analysis of Iron in Lawn Fertilizer: A Sampling Study
Michael A. JeannotJournal of Chemical Education2006 83 (2), 243Analysis of Iron in Lawn Fertilizer: A Sampling Study
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 ...
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- Received: August 03, 2009
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