According to this information in parenthesis how do I answer these question atr the bottom numbered?

(The article chosen is titled The Study of Teaching Effective Strategies on Student's Math Achievements where the study "is performed to examine the students' math and reading skills and their study skills that impact on their academic progress" (Behzadi et al., 2014). The research design used was quasi-experimental with quasi-cluster sampling of seventeen schools.

The authors used a t-test to compare the means of the students taught with a focus on study skills versus students taught traditionally. A t-test would be the best choice because according to Frankfort-Nachmias et al. (2020), a t-test is used to compare the means of two groups to determine if there is an effect on the population. The authors displayed the data in four tables. The first table listed the descriptive statistics, the second table showed a Kolmogorov-Smimov test, the third table was a t-test for the pretests and the fourth table was a t-test for the posttests. The t-test tables showed "that the students who were taught with emphasis on study skills versus students who have been traditionally trained, had better math performance and higher academic achievement" (Behzadi et al., 2014).)

The results from Table 3 showed there was no meaningful difference between the means of the group of students who were taught with the emphasis on study skills and the group of students who were taught traditionally.Which is the research design used by the authors?

1. Why did the authors use this t test?

2. Do you think it's the most appropriate choice? Why or why not?

3. Did the authors display the data?

4. Do the results stand alone? Why or why not?

5. Did the authors report effect size? If yes, is this meaningful?