Table 5. M1 and M2 students vs. M3 and M4 students t-test (n=165).

Source		Levene's test for equality of variances		t-test for equality of means
		F	p	t	df	p (2-tailed)	Mean difference	Standard error difference	95%CI
									Lower	Upper
P Score	Equal variances assumed	0.344	0.559	-0.553	163	0.581	-0.015	0.027	-0.069	0.039
	Equal variances not assumed			-0.551	154.88	0.582	-0.015	0.028	-0.070	0.039
Stage	Equal variances assumed	6.895	0.010	0.0135	163	0.989	0.001	0.088	-0.173	0.175
	Equal variances not assumed			0.0138	162.98	0.989	0.001	0.0863	-0.169	0.172
Stage Triad	Equal variances assumed	0.382	0.537	0.015	163	0.988	0.002	0.131	-0.256	0.260
	Equal variances not assumed			0.015	158.12	0.988	0.002	0.130	-0.255	0.259