Page 15 - qp_17
P. 15
b) Estimation Of Between Run Imprecision
1. Calculate between run variance(σ BR)
2
QC Level :1
DAY MEAN (Mean –overall Mean)
2
1 124.133
2 124.433
3 123.500
4 121.967
5 122.467
Overall Mean 123.310
Between RunVariance (σ BR)
2
σ = Σ(Xi –MEAN) 2
2
n-1
Where n: no of days=5
QC LEVEL : 2
DAY MEAN (Mean –overall Mean)
2
1 124.133
2 124.433
3 123.500
4 121.967
5 122.467
Overall Mean 123.310
Between Run Variance (σ BR)
2
σ = Σ(Xi –MEAN) 2
2
n-1
Where n: no of days=5
