i do not understand how to answer these questions related to this article

APA-formatted reference:

Carter, S. L. (2005). An empirical analysis of the effects of a possible sinus infection and weighted vest on functional analysis outcomes of self-injury exhibited by a child with autism. Journal of Early and Intensive Behavior Intervention, 2(4), 252-258. https://doiorg.library.capella.edu/10.1037/h0100318

What is the Dependent Variable?

What is the Independent Variable?

Describe the implementation of the independent variable. This should be the intervention or interventions used?

What is the Single-Subject Design used?

Describe the data collection procedure and interobserver agreement (IOA) method used?

Describe the internal, external, and social validity that is used with-in the article ?

Describe the conclusions of the study, including the effectiveness of the interventions?