A study investigating whether there is a link between teenagers smoking in movies and an interest in smoking among kids age 7-9. Investigators showed a movie to a group of kids where teenage characters smoked. After watching the movie, children were left in a room with different types of candy, including candy cigarettes. There were two observers scoring the children's actions and documenting whether they chose candy cigarettes or pretended to smoke with any of the candy. The observers ended up scoring the children differently. This is an example of: Group of answer choices Intra-subject variation. Intra-observer variation. Inter-observer variation None of the answers listed here are correct