Find the name of students who took some course offered by Statistics department.
SELECT T3.name FROM course AS T1 JOIN takes AS T2 ON T1.course_id  =  T2.course_id JOIN student AS T3 ON T2.id  =  T3.id WHERE T1.dept_name  =  'Statistics'
students who took some course offered by department refers to joining tables course, takes, and student based on course_id and student id; department is specified by dept_name;