Question: Suppose that your team has been analyzing data from an impact evaluation that used a posttest-only control group design. There were 227 participants in the treatment group, and 236 in the control group. The key outcome is a scale score measuring social support. In the dataset, the experimental group variable is named TREAT, and takes the value 0 for control group members and 1 for treatment group members; while the outcome variable is named SOCSUPP. A member of your team used SPSS to conduct a two-sample t-test, and you have been presented with the output appearing in Appendix 4. How would you quantify the estimated effect of the intervention in terms of a mean difference, and does the statistical test provide support for the effectiveness of the intervention?

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