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Scary-Movie Heart Rates
Before watching a scary movie, the members of a theater
audience agreed to have their heart rates monitored. They
were asked to sit in silence for 10 minutes before the film
began. The movie was then shown from beginning to end.
The scatter plot below summarizes the data collected by all
of the heart monitors from ten minutes before the start of
the movie to the end of the movie.
Which is a possible hypothesis most likely being tested in this experiment?
(1) Silence in a theater increases the heart rates of the audience members.
(2) The length of a movie causes changes in heart rate.
(3) Watching scary movies will increase the heart rates of audience members.
(4) Do heart rates increase when watching scary movies?
ANSWER:
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Answer
(4) Do heart rates increase when watching scary movies?