Testing of industrial products - Aggregates for construction

Data obtained in the cross-testing experiments on the Methylene Blue test

Notes.? = straggler (significant at the 5% level). ?? = outlier (significant at the 1% level).

Table 1. Data as reported by the participants (MB units).
Laboratory code		Level 1		Level 2		Level 3
letter	number	Test portion 1	Test portion 2	Test portion 1	Test portion 2	Test portion 1	Test portion 2
A	2	3.50	3.27	1.74	1.85	1.23	1.22
B	4	3.11	3.57	1.51	1.56	0.98	1.03
C	6	3.79	3.79	1.46	1.46	1.05	1.07
D	8	3.43	3.30	1.22	1.43	1.18	0.86
E	27	4.45	4.65	2.67	2.53	1.31	1.35
F	30	2.84	-.--	1.27	-.--	0.72	-.--
G	31	3.26	3.41	1.89	1.76	0.87	0.81
H	32	3.48	3.36	1.50	1.50	0.99	0.86
I	34	3.97	3.88	1.78	1.86	0.91	1.07
J	35	2.60	2.57	1.40	1.24	0.80	0.75
K	54	2.94	3.19	1.70	1.79	1.11	1.03
L	70	2.80	2.62	1.45	1.37	1.10	0.96
M	96	3.11	3.20	2.22	2.22	1.25	1.24
N	112	3.86	3.50	1.66	1.68	0.90	0.88
O	128	2.33	2.24	1.24	1.24	0.74	0.75
P	129	4.78 ??	5.87 ??	2.80	2.68	1.43	1.74
Q	147	2.86	2.87	1.64	1.69	1.16	1.17
R	149	3.00	2.83	1.45	1.51	0.73	0.89
S	185	4.68	4.47	1.72	1.78	1.03	1.07
T	190	2.75	2.95	1.45	1.55	0.85	0.85
U	204	4.21	4.04	1.73	1.70	1.00	1.15
V	205	2.99	3.01	1.48	1.47	1.05	0.96
W	216	3.64	3.74	1.70	1.75	1.20	1.00
X	218	3.66	3.61	1.93	2.01	1.40	1.36
Y	224	4.15	4.09	1.87	2.00	1.03	1.11
Z	248	3.15	3.22	1.66	1.70	0.75	0.77
a	251	0.74 ?	0.60 ?	1.10	1.25	0.60	0.60
b	252	5.55	5.20	2.65 ?	2.30 ?	1.50	1.20
c	260	2.44	2.37	1.08	1.07	0.51	0.75
d	274	3.21	3.18	2.08 ?	1.74 ?	0.97	1.08
e	310	2.95	3.00	1.31	1.41	0.82	0.81
f	312	4.02	4.02	0.75	0.75	0.65	0.65
g	95	3.61	3.22	1.45	1.54	0.94	0.85
h	106	2.59	2.49	1.09	1.23	0.69	0.75
Average		3.36		1.64		0.98