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Psy 315 Chapter#7 - 14

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14. Evolutionary theories often emphasize that humans have adapted to their physical
environment. One such theory hypothesizes that people should spontaneously follow a 24-
hour cycle of sleeping and waking—even if they are not exposed to the usual pattern of
sunlight. To test this notion, eight paid volunteers were placed (individually) in a room in
which there was no light from the outside and no clocks or other indications of time. They
could turn the lights on and off as they wished. After a month in the room, each individual
tended to develop a steady cycle. Their cycles at the end of the study were as follows: 25, 27,
25, 23, 24, 25, 26, and 25. Using the 5% level of significance, what should we conclude about
the theory that 24 hours is the natural cycle? (That is, does the average cycle length under
these conditions differ significantly from 24 hours?) (a) Use the steps of hypothesis testing.
(b) Sketch the distributions involved. (c) Explain your answer to someone who has never
taken a course in statistics.
Research Hypothesis: The average cycle length will differ significantly from 24 hours.
Null Hypothesis: The average cycle length will not differ from 24 hours.
Population 1: People of the general population.
Population 2: People within the testing rooms.
A.
N=8

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14. Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking-even if they are not exposed to the usual pattern of sunlight. To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time. They could turn the lights on and off as they wished. After a month in the room, each individual tended to develop a steady cycle. Their cycles at the end of the ...
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