EXERCÍCIO 4 – VALIDADE INTERNA E VALIDADE ESTATÍSTICA Investigação Científica em Psicologia: Teoria e Prática
	SPSS	OUTPUT 4
	T Teste (Amostras Independentes)

Comandos

GET

 FILE='C:\Documents and Settings\user\Desktop\E04_DATA1.sav'.

T-TEST

 GROUPS=vi(1 2)

 /MISSING=ANALYSIS

 /VARIABLES=vd

 /CRITERIA=CIN(.95).

Output

T-Test

Group Statistics
	VI	N	Mean	Std. Deviation	Std. Error Mean
VD	1	15	12,2667	2,1202	,5474
	2	15	13,9333	2,1536	,5561

Independent Samples Test
		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
VD	Equal variances assumed	,0034	,9542	-2,1359	28	,0416	-1,6667	,7803	-3,2651	-,0683
	Equal variances not assumed			-2,1359	27,9932	,0416	-1,6667	,7803	-3,2651	-,0682

Ver fórmulas

SPSS	OUTPUT 5
Coeficiente de Correlação: Comparação das Probabilidades Associadas a r e a tobs

Comandos

GET

 FILE='C:\Documents and Settings\user\Desktop\E04_DATA1.sav'.

CORRELATIONS

 /VARIABLES=vi vd

 /PRINT=TWOTAIL NOSIG

 /MISSING=PAIRWISE.

Output

Correlations

Correlations
		VI	VD
VI	Pearson Correlation	1,0000	,3743(*)
	Sig. (2-tailed)	,	,0416
	N	30	30
VD	Pearson Correlation	,3743(*)	1,0000
	Sig. (2-tailed)	,0416	,
	N	30	30
* Correlation is significant at the 0.05 level (2-tailed).

SPSS	OUTPUT 6
T Teste (Amostras Independentes / VD = Resultados Diferenciais)

Comandos

GET

 FILE='C:\Documents and Settings\user\Desktop\E04_DATA2.sav'.

COMPUTE R_DIF = pos_test - pre_test.

EXECUTE.

T-TEST

 GROUPS=vi(1 2)

 /MISSING=ANALYSIS

 /VARIABLES=r_dif

 /CRITERIA=CIN(.95).

Output

T-Test

Group Statistics
	VI	N	Mean	Std. Deviation	Std. Error Mean
R_DIF	1	15	4,6000	1,7238	,4451
	2	15	6,3333	1,4475	,3737

Independent Samples Test
		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
R_DIF	Equal variances assumed	,0375	,8479	-2,9824	28	,0059	-1,7333	,5812	-2,9238	-,5428
	Equal variances not assumed			-2,9824	27,1870	,0060	-1,7333	,5812	-2,9254	-,5412

Ver Procedimentos e Outputs em
Análise do Poder: Comparação de duas médias (T de Student / Grupos Independentes)

SPSS: SYNTAX FILES

Índice de outputs

BASES DE Dados

Última actualização: 2011-10-21