Application of Statistical Concepts in the Determination of Weight Variation in Samples

1731 Words Nov 20th, 2011 7 Pages
Application of Statistical Concepts In The Determination Of Weight Variation In Samples
Insti of Chemy, Univ of the Phili, Dili, QC
Dept of MolBio and Biotech, CS, Univ of the Phili, Dili, QC
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.
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In data Set2, the computed mean was 3.6529g, the computed standard deviation was 0.078456569, the computed relative standard deviation was 21.47788599, the range computed was 0.218, and the relative range computed was 59.67861151.
Table 3. Results of Various Computations Used to Analyze Data Data Set | mean | Standard deviation | Relative standard deviation | Range | Relative Range | 1 | 3.6270g | 0.02633 | 7.2607 | 0.03 | 18.4726 | 2 | 3.6529g | 0.07846 | 21.4779 | 0.218 | 59.6786 |

Since the standard deviations in both sets are relatively low, one can conclude that the values are close together, therefore there is relatively high precision within the data. In addition, the pooled standard deviation for all the groups was computed and found out to be 0.052299073 for Data Set1 and 0.305063684 for Data Set2, both of which are very low and therefore all the data gathered by all of the groups are close together (precision is high).
After analyzing the data using statistical computations, the values were concluded to be of high precision. Overall, the experiment was