Have you even bothered to try it?
Make yourself a table with one INTEGER column.
INSERT values 1, 2 and 3.
Now SELECT with possible combinations of OR and AND (and draw your own conclusions).
Anyway, any SQL book would explain that the order of precedence of OR and AND is the same.
If you want to change that you have to use ( ) to group, eg:
http://www.w3schools.com/sql/sql_and_or.asp.