Meth	N	Mean	Grouping
GD	24	59.50	A	The two methods were grouped together and not significantly different.
PC	24	57.93	A

Oper	N	Mean	Grouping
3	12	65.81	A	Operator 3 was significantly higher than Operators 1 and 2.
4	12	58.05	A B
2	12	57.00	B
1	12	54.00	B

Meth	Oper	N	Mean	Grouping
GD	3	6	76.67	A	Operator 3 GD test results were higher than all except Operator 4 PC results, which in turn were not different from the rest.
PC	4	6	63.93	A B
PC	2	6	58.67	B
GD	2	6	55.33	B
PC	3	6	54.95	B
PC	1	6	54.17	B
GD	1	6	53.83	B
GD	4	6	52.17	B