296Y: Haunted house with shrunken ghost (Solved)

I am looking for the title of a book from my childhood. I was born in 1982. The book might be a Bugs Bunny book where he moves to a new house and doesn’t realize the house already has someone living there; a ghost. The ghost tries everything to scare Bugs Bunny away. He rattles chains, he moans, nothing works. Finally late one night the ghost and Bugs have an encounter and somehow Bugs spills juice on the ghost. Now the ghost is really depressed, can’t get rid of Bugs and has a stain. So Bugs washes the ghosts sheet and accidentally shrinks him to a tiny ghost. Distraught and embarrassed the ghost and Bugs work through their problems and end up sharing the house as friends.

Side note: it might not be Bugs Bunny, it might be the Pink Panther. I can’t remember!

272I: A girl experiences a ghostly phenomenon

This was a book my doctor had in his office when I was a kid in the 70s. It was a small paperback about a house that was haunted by children who used to live there–I think there may have been a murder committed that started the haunting, and a little girl who was either living in the house or had visited it who was experiencing the ghostly phenomenon.