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Table 2

Nominal

T

stat

p

-value

1.18

0.1

1.21

0.0

1.16

0.1

1.17

0.1

1.19

0.0

1.13

0.1

1.16

0.1

1.16

0.1

1.17

0.1

Mean

1.2

0.1

SD

0.0

0.0

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

0.000

1.2

-0.1

Uncertainty Certified range Concentration

Difference from

certified value

Confidence interval

- 1.2

0.19

1.04 - 1.42

7.969

S

RM 1849a

V

itamin D3

1.23

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

VitD-17 MEF (February 2016)

FOR ERP USE ONLY

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