Effect of the VAN Hiele Instructional Model on Students’ Achievement in Geometry

Table 6

Independent Sample t-test analysis results.

		Levene’s test for equality of variances		t-test for equality of means
		F	Sig.	T	df	Sig. (2-tailed)	Mean difference	Std. error difference	95% Confidence interval of the difference
									Lower	Upper
Posttest	Equal variances assumed	0.022	0.883	4.257	73	0.000	18.844	4.427	10.022	27.666
	Equal variances not assumed			4.249	71.139	0.000	18.844	4.434	10.002	27.686