Despite jem's disagreement, scout says she thinks that boo radley is in the radley home and watching the kids play. why does scout feel so certain? when does scout share her evidence with the reader? how does lee foreshadow that revelation?

Scout thinks boo radley is watching the kids, but jem has reason to doubt the validity of scout's claim. There is no reason for jem to believe scout without any evidence to back up his claim. There are holes in the story and room for disbelief.