The scatterplot below shows the shoe sizes of students and the number of books the students collected for the library book drive.

A graph titled Books for the Library has shoe size on the x-axis, and number of books on the y-axis. Points are scattered.

Which statement about the scatterplot is true?
In general, each student collected a number of books equal to his or her shoe size.
In general, the shoe size of a student does not affect the number of books collected.
As shoe size increases, the number of books collected decreases.
As shoe size increases, the number of books collected increases.