Essay
A study tested the effects of science fiction movies on people's belief in the supernatural. A scale was designed to measure the degree that a person believes in the supernatural (high scores indicate high levels of belief). Seven participants completed the scale before and after watching a popular science fiction movie. Participants' scores are listed below. Assume that the researcher had reason to expect participants to believe less in the supernatural after watching the movie.
Belief-in-Supernatural Scores, Before and After Watching Science Fiction Movie
Carry out a t test for dependent means (using the .01 significance level).
a. Use the five steps of hypothesis testing.
b. Figure the effect size and find the approximate power of this study.
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