Independent T-test
when we compare the average value of the dependent variable between two independent groups. There is an experimental group and a control
e.g. are users of social media more narcissistic than non-user
Dependent T-test
when we compare the average value of the dependent variable from one group twice
e.g. English proficiency before and after IELTS traininf
When regression analysis
We want tot test a hypothesis that includes quantifiable independent and dependent variables
e.g. does size of a house influence selling price