2.The education department is interested in the difference between two interventions to improve critical thinking among students. Two samples from different classes were chosen for the study. Another class was provided with an intervention but the other continued with the traditional method of teaching for critical thinking. a. Test for the hypothesis that there is a statistically significant between the two groups of students. Use .05 significant level. Show all your hypothesis testing steps and manual calculations. b. Calculate the effect size of the intervention.