Application of Statistical Concepts in the Determination of Weight Variation in Samples
Application of Statistical Concepts In The Determination Of Weight Variation In Samples
Margabacus
Insti of Chemy, Univ of the Phili, Dili, QC
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Dept of MolBio and Biotech, CS, Univ of the Phili, Dili, QC
ABSTRACT
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The objectives of the experiment are to use the analytical balance correctly, to gain an understanding of some concepts of statistical chemistry, and to apply statistical concepts in analytical chemistry. The experiment preceded by ten teams weighing ten 25-centavo coins using an analytical balance, weighing by difference. After doing the calculations to analyze the data, some of the values were rejected from their data sets. Overall, the results of the calculations denote that the data values gathered have high precision since the pooled standard deviation is low. The experiment shows that in order to analyze data properly and objectively, one must apply statistical concepts.
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Introduction All measurements are subjected to random errors. Sometimes, data can be either accepted or rejected before they are further analyzed. This is done by calculating the Q-test ( [1]). Computing for the confidence limit ( [2]) in 95% confidence level provides the range where the true value lies. Precision refers to the degree of reproducibility of a measures quantity, or the closeness of agreement when the same quantity is measured several times. Precision is high when the measurements deviate by only a small amount from the average; it is low if there is wide deviation. Precision in the data can be analyzed by performing calculations, including: computing for the mean or average ([3]) which provides an estimate of the true value; computing for the standard deviation ( [4]), the square root of variance, the measure of scatter of random error; computing for relative standard deviation in parts per million ([5]); computing for
Margabacus
Insti of Chemy, Univ of the Phili, Dili, QC
-------------------------------------------------
Dept of MolBio and Biotech, CS, Univ of the Phili, Dili, QC
ABSTRACT
-------------------------------------------------
The objectives of the experiment are to use the analytical balance correctly, to gain an understanding of some concepts of statistical chemistry, and to apply statistical concepts in analytical chemistry. The experiment preceded by ten teams weighing ten 25-centavo coins using an analytical balance, weighing by difference. After doing the calculations to analyze the data, some of the values were rejected from their data sets. Overall, the results of the calculations denote that the data values gathered have high precision since the pooled standard deviation is low. The experiment shows that in order to analyze data properly and objectively, one must apply statistical concepts.
-------------------------------------------------
Introduction All measurements are subjected to random errors. Sometimes, data can be either accepted or rejected before they are further analyzed. This is done by calculating the Q-test ( [1]). Computing for the confidence limit ( [2]) in 95% confidence level provides the range where the true value lies. Precision refers to the degree of reproducibility of a measures quantity, or the closeness of agreement when the same quantity is measured several times. Precision is high when the measurements deviate by only a small amount from the average; it is low if there is wide deviation. Precision in the data can be analyzed by performing calculations, including: computing for the mean or average ([3]) which provides an estimate of the true value; computing for the standard deviation ( [4]), the square root of variance, the measure of scatter of random error; computing for relative standard deviation in parts per million ([5]); computing for
References: [1] Petrucci, Ralph H., William S. Harwood, and F. Geoffrey Herring. General Chemistry. 8th edition. Pearson Education Asia Pte Ltd. 2002. [2] Keenan, Charles W., Donald C. Kleinfelter, and Jesse H. Wood. General College Chemistry. 6th edition. JMC Press Inc. 1980 [3] Himmelblau, David