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5 A trainee technician was required to carry out an analysis of a standard sample...

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Algebra

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5 A trainee technician was required to carry out an analysis of a standard sample containing 31 20 alumina standard deviation 0 22 established by extensive previous analysis The trainee carried out 8 replicates with the following percentage results 31 09 28 85 31 07 31 10 31 09 31 12 I 31 07 31 13 Analyze the data at the 95 CL for gross errors calculate the mean standard deviation and relat standard deviation HINT Rejected values should not be retested nor included in the calculation of the mean SD RSD

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