Now is a bit strong. How 'bout.
The purpose of the study was to solve a perennial question. Does watching violence on tv cause adolescents to become more aggressive or are adolescents who are more aggressive simply more likely to enjoy violence on tv?
The methods used were both correlation and field studies..
Forget one big sentence, I'm assuming the subject deserves better.
Start with an explanation of what is in the text book. Don't make people guess. In other words, a lecture should be more of a story than instruction. Being succinct is more important than being brief.
Then perhaps you could say..
To elaborate, during the field studies we observed...
Correlation, on the other hand, is .. brief explanation... and we found this...
In conclusion, between the text book expectations and our experiments (lack of a better word) our findings were.. are..
I have no idea if this is a group project or not, if not, change all the plurals to singular.