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Table 3

Accuracy - Analytical bias compared to reference material

SRM Product

Code

Analyte

Reference

value

1

Measured value

Bias

(mg/kg pwd)

Conc. (mg/kg pwd)

T

stat

p

-value Confidence Interval

1.969

2.067

2.081

2.023

2.047

-

1.971

2.013

1.987

1.995

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

0.08234797 1.9856

2.0484

1849a

CLC-10b

Biotin

1.99

1.985

SPIFAN ERP Checklist v1.0

Bio-03 (February 2016)

FOR ERP USE ONLY

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