SPIFAN Nutrients ERP Book 9-29-15

Table 2

Nominal

stat

-value

66.7

1.5

66.5

1.7

67.7

0.5

66.8

1.4

68.3

-0.1

69.5

-1.3

70.1

-1.9

68.1

0.2

66.9

1.3

Mean

67.8

0.4

1.3

stat

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

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

= number of replicate analyses of SRM

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

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

-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

= number of replicate analyses of SRM

SRM1849a

Pantothenic acid

68.2

1.9

66.3 - 70.1

Certified range

66.8 - 68.8

Bias

Confidence interval

-0.4

0.847

0.422

Accuracy - Analytical bias compared to reference material

Certified Reference Material

Measured Results

CRM product

Analyte

Certified value Uncertainty

Concentration

Difference from

certified value

crit

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