Table 3.

Evaluation of computational concepts—Grade 3 and 4.

Computational concepts	Grade	N	BCTt	Mean	SD	Variance	Avg. sum
Sequences	3	20	Pre	0.883	0.196	0.038	17.667
			Post	0.933	0.100	0.010	18.667
	4	21	Pre	0.968	0.085	0.007	20.333
			Post	0.992	0.036	0.001	20.833
Simple loops	3	20	Pre	0.980	0.062	0.004	19.600
			Post	0.980	0.062	0.004	19.600
	4	21	Pre	0.933	0.115	0.013	19.600
			Post	0.933	0.097	0.009	19.600
Nested loops	3	20	Pre	0.764	0.238	0.056	15.286
			Post	0.836	0.219	0.048	16.714
	4	21	Pre	0.864	0.199	0.040	18.143
			Post	0.932	0.116	0.014	19.571
If-then conditionals	3	20	Pre	0.700	0.299	0.089	14.000
			Post	0.825	0.294	0.086	16.500
	4	21	Pre	0.810	0.249	0.062	17.000
			Post	0.881	0.218	0.048	18.500
If-then-else conditionals	3	20	Pre	0.400	0.348	0.121	8.000
			Post	0.725	0.413	0.170	14.500
	4	21	Pre	0.619	0.415	0.173	13.000
			Post	0.690	0.402	0.162	14.500
While conditionals	3	20	Pre	0.750	0.284	0.080	15.000
			Post	0.833	0.229	0.053	16.667
	4	21	Pre	0.635	0.315	0.099	13.333
			Post	0.762	0.261	0.068	16.000
Total	3	20	Pre	20.000	2.991	8.947	400
			Post	21.950	3.120	9.734	439
	4	21	Pre	21.429	2.925	8.557	450
			Post	22.429	2.039	4.157	471