Refer to the Week 5 t Test Exercises and follow the directions to perform a t test.

Part I: Independent Samples Test

It is hypothesized that women who work will experience less depression compared with those who do not.

1. According to the Polit2SetC dataset 773 of these women had jobs and 299 did not.
2. Sample size total is 1072.
3. The average (SD) CESD scores of the employed groups is 16,18 (11.53), and the non-employed groups is 19,80 (11.63).
4. The Levene’s statistic is 11.161, and the p-value is .001, indicating that the assumption of homogeneity of variance is violated. The assumption of equal variances is false.
5. The t-statistic is -4.222 with 1070 degrees of freedom and the p-value is < .001.
6. Data supports the hypothesis, that women working experience a lesser level of depression compared to women not working.

Part II: Paired Samples t-test

It is hypothesized that women reporting depression in Wave 1 and Wave 2 did not differ significantly in depression level.

1. Total sample size: 1144
2. At wave 1, the mean (SD), CES-D score is 16.12 (11.55), and at Wave 2, it is 14.51 (11.21).
3. The average difference in time between two periods is 1,61.
4. The t-statistic is 3.999 with 1143 degrees of freedom and the p-value is < .001.
5. There is no evidence to support the idea that depression levels are not significantly different between waves 1 and 2.

Tests of independent samples for the three outcomes

CES-D Score is a variable that represents the outcome. The other variables include SF12, SF12 Physical Health Component Score and SF12 Mental Health Component Score.

Hypothesis: Women without a diploma, GED, or high school certificate will have lower CESD scores, mental and physical health scores, than women who do.