WK5Assgn3 +Dohnji +N.doc
Part I
T-TEST GROUPS=Worknow (0 1) /MISSING=ANALYSIS /VARIABLES=CESD /CRITERIA=CI (.95).
T-Test
Group Statistics Currently employed? N Mean Std. Deviation Std. Error Mean
CES-D Score No 524 20.8965 12.46425 .54450 Yes 436 15.8239 10.13655 .48545
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
CES-D Score Equal variances assumed 23.615 .000 6.825 958 .000 5.07264 .74326 3.61404 6.53124 Equal variances not assumed 6.954 957.514 .000 5.07264 .72949 3.64107 6.50421
T-TEST PAIRS=CESD WITH cesdwav1 (PAIRED) /CRITERIA=CI (.9500) /MISSING=ANALYSIS.
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The mean CES-D score (SD) for the two groups are. M=20.8965 for the women who not employed and SD =12.46425 for the women who not employed and M=15.8239 for the women who are employed and SD =10.13655 for the women who are employed.
The Levene’s test for equality of variances level of significance is p =.000. Because the resulting p-value of Levene's test is less than some significance level of 0.05, the obtained differences in sample variances are unlikely to have occurred based on sampling from a population with equal variances. This level of significance is less than .05 and thus, equal variances are not assumed.
The values of the t statistic, number of degrees of freedom, and the p value are: t = 6.954; df = 957.514; p = .000. The data supports the hypothesis that there is a lower rate of depression in women who are working compared with women who are not working (p = .000 using an assumed 95% confidence level).
Part
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T-Test
Group Statistics Currently employed? N Mean Std. Deviation Std. Error Mean
CES-D Score No 524 20.8965 12.46425 .54450 Yes 436 15.8239 10.13655 .48545
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
CES-D Score Equal variances assumed 23.615 .000 6.825 958 .000 5.07264 .74326 3.61404 6.53124 Equal variances not assumed 6.954 957.514 .000 5.07264 .72949 3.64107 6.50421
T-TEST PAIRS=cesd WITH cesdwav1 (PAIRED) /CRITERIA=CI (.9500) /MISSING=ANALYSIS.
T-Test
Paired Samples Statistics Mean N Std. Deviation Std. Error Mean
Pair 1 CES-D Score 18.5516 157 11.87462 .94770 CESD Score, Wave 1 17.8344 157 11.49908 .91773
Paired Samples Correlations N Correlation Sig.
Pair 1 CES-D Score & CESD Score, Wave 1 157 .412 .000
Paired Samples Test Paired Differences t df Sig. (2-tailed) Mean Std. Deviation Std. Error Mean 95% Confidence Interval of the Difference Lower Upper
Pair 1 CES-D Score - CESD Score, Wave 1 .71718 12.67921 1.01191 -1.28164 2.71599 .709 156