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Table 2

Nominal

T

stat

p

-value

125.6

0.1

128.5

-2.8

128.7

-3.0

128.8

-3.1

130.3

-4.6

130.0

-4.3

131.2

-5.5

136.4

-10.7

122.5

3.2

122.4

3.3

127.4

-1.7

130.2

-4.5

Mean

128.5

-2.8

SD

3.8

3.8

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

2.8

- 130.9

2.545

0.027

126.1

Bias

Accuracy - Analytical bias compared to reference material

Certified Reference Material

Measured Results

CRM product

Analyte

Certified value Uncertainty Certified range Concentration

Difference from

certified value

Confidence interval

SRM 1849a

Thiamin (ug/100g)

125.7

9.8

115.9 - 135.5

n

/

sd

d

d

d

n

t

crit

sd

n

t

crit

sd

crit

t

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