Strategies for Improving Students’ Language Skills by Using Information Technology in Higher Education English Education

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The difference significance test of oral performance

Class	Premeasurement		Posttest
	Cross-reference class	Laboratory class	Cross-reference class	Laboratory class
Average	58.90141791	57.63541299	59.66120431	69.79802286
Known covariance	348.3100525	326.0147391	345.75750563	291.01066302
Observed value	40	45	40	45
Hypothesis mean difference	0		0
z	0.37569033		3.68211902
P(Z⇐z) Double tail	0.82665995		0.00280069
z Double tail critical	1.91131250		2.67936651

The difference significance test of the previous survey and the post-test results

Class	Posttest	Premeasurement
Average	75.89694414	62.05796512
Known covariance	489.60090915	557.33210894
Observed value	45	45
Hypothesis mean difference	0
z	3.36602499
P(Z⇐z) Double tail	0.03578167
z Double tail critical	1.91232459

The difference significance test of the post-test comprehensive achievement

Class	Cross-reference class	Laboratory class
Average	68.94251039	75.89694414
Known covariance	510.33690457	489.60090915
Observed value	40	45
Hypothesis mean difference	0
z	1.99365115
P(Z⇐z) Double tail	0.04172116
z Double tail critical	1.96336405

The significance test of the previous test and the performance of the following

Class	Premeasurement		Posttest
	Cross-reference class	Laboratory class	Cross-reference class	Laboratory class
Average	8.96536145	8.23669876	9.01219556	12.36151196
Known covariance	15.00248691	14.79003125	12.03650491	14.60611757
Observed value	40	45	40	45
Hypothesis mean difference	0		0
z	0.49360654		4.59683615
P(Z⇐z) Double tail	0.68917153		0.03992736
z Double tail critical	0.19833469		2.75915344

The difference significance test of the previous survey

Class	Cross-reference class	Laboratory class
Average	66.19160844	62.05796512
Known covariance	521.42569315	557.33210894
Observed value	40	45
Hypothesis mean difference	0
z	0.29936654
P(Z⇐z) Double tail	0.78954276
z Double tail critical	1.89571243