Table 12.

Calculation of the range and 95 % confidence level for the SRM 640d input material.

	WS3-SRM	WS4-SRM	WS3-SRM & WS4-SRM
Range	47 × 10−9	73 × 10−9	79 × 10−9
95 % confidence level, 2σ	±26 × 10−9	±35 × 10−9	±33 × 10−9