Walker T I
Int J Environ Anal Chem. 1977;5(1):25-33. doi: 10.1080/03067317708071127.
Statistical tests were carried out on the results of chemical analysis for total mercury concentrations of replicate samples of muscle tissue of school shark Galeorhinus australis (Macleay) and gummy shark Mustelus antarcticus Guenther from six independent analytical laboratories. These tests showed that one laboratory produced results 9% below the overall average of all results, another 1% below average while the other four were all 5% above average. Moreover, one laboratory had significantly lower scatter of results than the others, and the percentage scatter (standard error expressed as a percentage of the mean) in two of the laboratories tended to diminish as the magnitude of the results increased. Correction for what were concluded to be wild points indicated that the scatter for all laboratories was below 14%.
对来自六个独立分析实验室的南澳大利亚睡鲨（Galeorhinus australis，Macleay）和南极星鲨（Mustelus antarcticus，Guenther）肌肉组织重复样本中总汞浓度的化学分析结果进行了统计测试。这些测试表明，一个实验室的结果比所有结果的总体平均值低9%，另一个低1%，而其他四个实验室的结果均比平均值高5%。此外，一个实验室结果的离散度明显低于其他实验室，并且其中两个实验室的百分比离散度（标准误差表示为平均值的百分比）随着结果数值的增加而趋于减小。对被判定为异常值进行校正后表明，所有实验室的离散度均低于14%。
