Table 9.

Statistics of t′ at silver point.^1,2

RT set		Run 1	Run 2	Combined runs
NIM	Mean	960.5269	960.5240	960.5254
	SD3	0.0052	0.0042	0.0046
	Range	0.0121	0.0103	0.0139
NBS	Mean	960.5211	960.5200	960.5206
	SD	0.0063	0.0009	0.0041
	Range	0.0124	0.0018	0.0124
Combined set	Mean	960.5244	960.5223	960.5233
	SD	0.0060	0.0038	0.0049
	Range	0.0171	0.0103	0.0171

¹W(t″)= 1+at″ +bt″² , where the coefficients a and b are determined from values of W(AL) and W(AU) given in table 6, and t″(AL)=660.408, t″(AU)=1062.503 (see table 6).

²Values of t″(AG) derived from values of W(AG) given in table 3 using the above equation.

³SD: estimate of standard deviation of one value in indicated set.