2 discussion questions apa response required 1page

What kinds of extraneous variables (not cited in the studies) do you think could have affected the relationships between the independent variables and the dependent variables in both the Messina et al. and Coyne et al. studies?

How effectively do you think the Coyne et al. study and the Messina et al. study both used their review of literature to help the reader understand why the research question was asked? How could they have done it more effectively?