Columbia subject headings:
Harvard subject headings:
Mathematics--Study and teaching--Japan--Statistics.
Mathematics--Study and teaching--United States--Statistics.
Middle school students--Study and teaching--Japan--Statistics.
Middle school students--Study and teaching--United States--Statistics.
Princeton subject headings:
Mathematics--Study and teaching (Middle school)--Japan--Evaluation--Statistics.
Mathematics--Study and teaching (Middle school)--United States--Evaluation--Statistics.
Statistics.