What is the name of the clown in Stephen King's 'It'?

What is the name of the killer doll in 'Child's Play'? What is the name of the killer in 'The Texas Chain Saw Massacre' (1974)? What mask does the killer wear in 'Scream' (1996)? What type of mask does Jason Voorhees famously wear? In which state is the fictional town of Derry, from 'It', located? Which 1973 horror film is about the demonic possession of a girl named Regan? Which horror film features a cursed videotape that kills viewers in seven days? In which horror film do characters communicate using sign language to avoid sound-hunting creatures?