L. A researcher is interested in studying the effects of story endings on preference ratings. He randomly assigns participants into two groups: predictable ending or surprise ending. He instructs them to read the story and provide preference ratings. The experimenter's variation of story endings is a _straightforward (straightforward or staged) manipulation. Z. A researcher was interested in investigating the vocabulary skills of 6th graders in a program for gifted students. She gave a group of participants a test of vocabulary that was aimed at the 7th-grade level. She quickly discovered that there was limited variability in the scores because nearly all the students answered 90% or more of the questions correctly. This outcome is called a _ceiling effect.
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