During the development of a sampling plan for the determination of Cu in tree bark a standard
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Question:
During the development of a sampling plan for the determination of Cu in tree bark a standard reference material of homogenized pine needles was used to study the effects of sampling variance.
a) Using the following data determine the variance due to sampling for this method.
b) If 0.250 g samples of tree bark were used, what mass of sample should be collected such that the relative standard deviation for sampling is ± 5%?
Cu in Tree Bark Samples (ppm) | Cu in Pine Needle SRM (ppm) |
114 | 178 |
89.0 | 174 |
132 | 180 |
105 | 181 |
94.0 | 173 |
Related Book For
Statistics for Business and Economics
ISBN: 978-0134506593
13th edition
Authors: James T. McClave, P. George Benson, Terry Sincich
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