I have two separate groups of students. A control (n=23) and intervention (n=19) group. Both groups took a pre test measure (score of 0-100). I have done an independent t-test on the Post_minus_Pre test scores and found the following:
Tests for normality using Shapiro-Wilk showed normally distributed data. Levene's test shows non-equal variances, so I'll need to interpret the alternative scores.
- How can I properly interpret this table, given that I'm testing the differences of differences (i.e., differences from pre-post scores)? I'm having a heck of a time finding guidance on this kind of test (lots of guidance on other independent t-tests). What I think is correct is: "The intervention group showed a significant decrease of 16.95 (SD=20.16) of test scores compared to the control group." But this interpretation does not seem to take into account the control group score.
- What are the best practices for presenting this in a table form, specifically with APA?