Mean of Readings [X-] :
Range of Readings [R] :
Value of d2* for n=15, N=1
Standard Deviation (sr) : R/d2*
Standard Error of Mean (sb) = (s//-n)
Bias (Obs. Av. - Ref. Value)
Calculated "t" statistic (Bias / sb)
Degrees of freedom v as a function of d2* for n = 15 and N = 1
Significant 't' value (for v = 10.8 and confidence level of 1- a/2 = 0.975
Value of d2 from Statistical Tables
97.5 % Upper confidence level for Bias:
97.5 % Lower confidence level for Bias:
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