I want to research the impact of internal audit function on the work of external auditor, I will extend the research by showing the extent of the impact of internal auditors relating to some factors such as independence, integrity, and transparency on external auditors work.

I will collect the data by using survey and the sample from external auditor firms.

I am new at this, so I am trying to figure out which test I need to use to analyze my data and the reason behind choosing that test, also did am I correct in choosing only external auditors as sample?

thanks in advance