Statistical tools and approaches to validate analytical methods: methodology and practical examples | International Journal of Metrology and Quality Engineering (IJMQE)

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Table 6

Example of results obtained for a precision study [15].

	Repeatability		Replicability

	1^st day	2^nd day
Number (n)	10	10	10
Mean (d)	48.2531	49.05252	50
Standard deviation (Sd)	0.0264673	0.056026	0.0168736
CV%	0.054851	0.11421617	0.03356
Precision	96.38%	98.068%	99.45%
T_crit (95;9)	2.262	2.262
Error	3.62	1.931562
Confidence interval	48.253 ∓ 0.019	49.288 ∓ 0.196
Mean of means	48.65281
Mean of standard deviation	0.04124665

CV% = %RSD; Precision% = 2.8 × s_r, with s_r: standard deviation of these results.

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