correlation test of ASTM F963-11 test using test method CPSC-CH-E1003-09.1
Object: To perform reproducibility for test method CPSC-CH-E1003-09.1 for ASTM F963-11 between two performers
Sample: CRM NIST 2582(coating sample)
Equipment: (1) Microwave digestion oven
(2) Inductively Coupled Argon Plasma spectrometer
Procedure: Six trials were performed by two technicians compliance GC051.TP,
acquiring results as below.
Conducted by: A)XXX
B) YYY
Data:
Trial
Total lead Result (ppm)
(A)
(B)
1
210
203
2
213
209
3
209
202
4
207
204
5
211
209
6
206
212
Mean
209.3
206.5
S.D.
2.58
4.04
F
2.44
F0.05,5,5
5.05
t
1.33
t0.05,10
2.23
According to the equation:
F = , where S=standard deviation
when (f1=n1-1=5, f2=n2-1=5 and a=0.05), F0.05,n1-n2=F0.05,5,5 =5.05 could be found from distribution critical value table, as F<F0.05,5,5, t-test could be drawn.
t = , where =mean value, n=n1=n2=trials
when (f=n1+n2-2=10, af=0.05), t0.05,10 =2.23 could be found from distribution critical value table.
Criteria: The F should be less than Fcritical and t should be less than tcritical
Conclusion: The correlation test between CWZ and WZD were satisfactory.