Table 6:

Tests for equality of means of exposed and control population for IFVC

Worker Cat	Excat	n	MIFVC	VRIFVC	F	Fv1, v2,0.05	Sp	t	w1	t1α/2	tcr	tc	TEST
Labour	1	26	0.5296	0.01149	1.119	1.753	0.01116	75.9288*	--------	-------	-------	-----	t-test
Labour	2	31	0.5351	0.01180	1.142	1.720	0.01131	81.1394*	--------	-------	------	------	t-test
Labour	3	29	0.5317	0.01881	1.823*	1.733	-------	-------	0.00067	2.0480	2.0394	6.98895	Cochran-Cox
Labour	4	46	0.5884	0.01989	1.900*	1.645	-------	-------	0.00044	2.0160	2.0157	10.25850	Cochran-Cox
Dresser	1	27	0.5384	0.00296	3.477*	1.838	-------	-------	0.00011	2.0560	2.0283	11.59480	Cochran-Cox
Dresser	2	33	0.5726	0.01304	1.261	1.708	0.01186	92.5894*	-------	-------	------	-------	t-test
Dresser	3	31	0.6176	0.01957	1.889*	1.720	------	-------	0.00065	2.0420	2.0348	9.94380	Cochran-Cox
Dresser	4	35	0.6448	0.01306	1.258	1.696	0.01190	120.764*	------	------	-------	------	t-test
Driller	1	26	0.5969	0.00295	3.481*	1.858	-------	---------	0.00012	2.0600	2.0299	14.63055	Cochran- Cox
Driller	2	33	0.6469	0.00561	1.855*	1.752	-------	--------	0.00018	2.0360	2.0239	16.03562	Cochran-Cox
Driller	3	28	0.6483	0.01018	1.006	1.824	0.01065	127.712*	------	------	------	------	t-test
Driller	4	29	0.6734	0.00612	1.689	1.798	0.00901	164.340*	-------	-------	------	------	t-test
Control Population		45	0.3209	0.01047	------	-------	--------	w2=0.00024		t2α/2 =2.0150	------	-------	--------

The critical value of ‘t’ i.e. t_{n1 + n2 − 2;α} is taken as 1.96 (i.e. for normal distribution)

^*Significant values of the test statistic under consideration.