4-The chapter that details the way in which the research was conducted is the 

A-Introduction 

B-Literature review

C-Research methodology O

D-Data analysis

5-studying 1 firm over 10 years is called 

A-Panel data 

B-Time series

C-Cross sectional

D-None of the above

6-the operational definition of Profit margin ? A-Gross income divided by sales B-Net income times sales C-Net income over sales D-Sales divided by total income