OMB Meeting Book_9-11-14
9/10/2014 Copyright 2006,2012 by AOAC International, all rights reserved.
AOAC International Interlaboratory Study Workbook
Version:
2.1
Blind (Unpaired) Replicates
AOAC 2011.10 Determination of Vitamin B12
Study name: Study date:
7/24/2014
Study Reported Values
Seq.
Item
Symbol
CLC10-B
E29VLV
Sample ID:
10 a
10 b
Total number of laboratories Total number of replicates
p
1 2 3 4 5 6 7 8
Sum(n(L)) XBARBAR
20
20
Overall mean of all data (grand mean) f Repeatability standard deviation Reproducibility standard deviation Repeatability relative standard deviation Reproducibility relative standard deviation
43.6551 3.0112 3.8583
0.4280 0.0208 0.0305
s(r) s(R)
RSD(r) RSD(R)
6.90 8.84
4.85 7.13
HORRAT value
0.34
0.20
a One laboratory excluded - Failed Single and Double Grubbs Test b One laboratory excluded - Failed Single Grubbs Test c One laboratory excluded - Failed Double Grubbs Test d Includes single determinations for 4 laboratories because of mislabeled product cans. e One laboratory excluded - Failed Cochran Test f Overall mean in mcg/100g RTF for all samples except CLC10-B. CLC10-B overall mean in mcg/kg powder
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