Hi
the quantity of visitors
never write like this,visitors could be only the numbers!!!!
fifteen days period
When is your period? mention a year.
the number of visits
again, you have to use amount with visits.
this same
the same
during the days
throughout the time scale or period.
The most popular music site is certainly the Pop Parade, which received a greater number of visits in almost everyday over the observed period.
good conclusion!
Try to focus on verb instead of subjects of your graph.
Think while you write,you can write:
Parade's number of visits was pratically always higher than the other website, except from the eleventh to thirteenth day.or
People more frequently visited Pop Parade's website than the Music Choice in the most of the period with the exception for last three days.Good luck,your writing is good.