People want to go to a private school because they think it is higher quality.
Also, some private schools teach religion class, and some people want their
kids to learn religion. Some think a private school would be less likely to have
gangs or drugs. Also, sometimes the size of the classroom at a public school
is too large, if the school is overcrowded, so the child doesn't receive as much
individual attention. That's going to be a tough paper, as it may seem politically
incorrect to criticize a school whose student body is from a poor neighborhood.
You can start off with the sentence:
Public school is free, while private education costs tens of thousands of dollars.
Some say you get what you pay for, but is this really the case? [start to insert statistical data you found].