Inter-Laboratory Validation of Method to Determine Residual Enrofloxacin in Chicken Meat

Table 3

Statistical evaluation of the inter-laboratory measurements for CRM.

Source of Variation^1)	Sum of Squares	df^5)	Mean Sum of Squares	F^8)	p	Fcrit
Between Laboratories	1.9396^2)	2	0.9698^6)	0.6161	0.503	5.143
Within Laboratories	7.5276^3)	6	1.574^7)
Total	9.4672^4)	8

output was performed in Microsoft Excel 2013.
of squared deviations of group means from grand mean (SSB)
of squared deviations of observations from their group mean (SSW)
of squared deviations of observations from grand mean (TSS = SSB+SSW)
of freedom
/2 
/6 
/(/6)
critical value of F at 95% probability level is much higher (5.143) than the observed value of F (0.6161), which means that the null hypothesis cannot be rejected.
(The null hypothesis, which assumes that there is no difference between the data from three different laboratories)