分析人员测定某项目的单个空白值20次，其测定值分别为0.006mg/L、0.006mg/L、0.010mg/L、0.015mg/L、0.011mg/L、0.010mg/L、0.010mg/L、0.010mg/L、0.013mg/L、0.015mg/L、0.015mg/L、0.015mg/L、0.012mg/L、0.014mg/L、0.010mg/L、0.005mg/L、0.005mg/L、0.012mg/L、0.012mg/L、0.005mg/L，请计算出该空白质控图的平均值、标准偏差、上控制限、上警告限
题目
分析人员测定某项目的单个空白值20次，其测定值分别为0.006mg/L、0.006mg/L、0.010mg/L、0.015mg/L、0.011mg/L、0.010mg/L、0.010mg/L、0.010mg/L、0.013mg/L、0.015mg/L、0.015mg/L、0.015mg/L、0.012mg/L、0.014mg/L、0.010mg/L、0.005mg/L、0.005mg/L、0.012mg/L、0.012mg/L、0.005mg/L，请计算出该空白质控图的平均值、标准偏差、上控制限、上警告限和上辅助限。
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参考答案和解析
正确答案:
X.平均=0.011mg/l
标准偏差Sb=0.004mg/l
上控制限X平均+3Sb=0.023mg/l
上警告限X平均+2Sb=0.019mg/l
上辅助限X平均+Sb=0.015mg/l
标准偏差Sb=0.004mg/l
上控制限X平均+3Sb=0.023mg/l
上警告限X平均+2Sb=0.019mg/l
上辅助限X平均+Sb=0.015mg/l