What level are you at (what year in high school , year 10, 11 or 12), or is this a college or uni assignment.
A hypothesis is best included in the abstract or introduction/theory section of a laboratory / experiment or metastudy writeup.
I see you are writing an essay.
If you are simply writing an essay based on a literature review , then the hypothesis goes in the abstract (briefly) and in more detail in your introduction section.
How many words are you limited to ?
You need to look at how papers are written in professional scientific journals (visit the sites for to get a handle on the format required for a proper scientific paper.
Try
http://library.newcastle.edu.au/sear...atter&1%2C%2C2
or
http://library.newcastle.edu.au/sear...1%2C/indexsort=-
you should be able to access this through your college or uni library , or get online access via your local library.