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Table 2

Nominal

T

stat

p

-value

12.9

0.6

13.6

-0.1

13.9

-0.4

12.9

0.5

13.4

0.1

12.9

0.6

13.0

0.5

13.3

0.2

13.0

0.5

Mean

13.2

0.3

SD

0.4

0.4

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.

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

SRM1849a

Pyridoxine

13.46

0.93

12.53 - 14.39

Certified range

12.9 - 13.5

Bias

Confidence interval

-0.3

2.238

0.056

Accuracy - Analytical bias compared to reference material

Certified Reference Material

Measured Results

CRM product

Analyte

Certified value Uncertainty

Concentration

Difference from

certified value

n

/

sd

d

d

d

n

t

crit

sd

n

t

crit

sd

crit

t

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