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Table 2

Nominal

T

stat

p

‐value

Mean   

SD   

T

stat

=

where:       = mean of the differences between measured results and reference value

sd  = standard deviation of the differences between results and reference value

n

  =  number of replicate analyses of SRM

H

0

:       = 0,   The null hypothesis is that there is no difference between the measured results and the certified value:

p

‐value: is the probability (at the 95% levels of confidence) of obtaining the test statistic assuming that the null hypothesis is true

p

‐value < 0.05 indicate a difference of statistical signifance between measured results and SRM

Uncertainty Certified range Concentration Difference from 

certified value

Confidence interval 

Bias

Accuracy ‐ Analytical bias compared to reference material

Certified Reference Material

Measured Results

CRM product

Analyte

Certified value

n

/

sd

d

d

d

n

t

crit

sd

n

t

crit

sd

crit

t

SPIFAN ERP Checklist v1.0

95% confidence interval: The true population of the measured value expected to fall within the confidence interval estimate 95% of the time

lower limit  = mean ‐

upper limit = mean +

where:           =  critical values of the t‐distribution

sd  = standard deviation of the differences between results an reference value

n

  =  number of replicate analyses of SRM

CAROT-02 MEF FORM (AUGUST 2016)

FOR ERP USE ONLY

DO NOT DISTRIBUTE