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. After a month in the room, each individual tended to develop a steady cycle. Their cycles at the end of the study were

24,

27,

24,

23,

24,

26,

27,

and

24

.

Using the 0.05 level of significance, what should be concluded about the theory that 24 hours is the natural cycle?

A. Determine the cutoff sample score?

B. Determine the sample score determine distribution?

C. Decide whether to reject the null hypothesis?

D.Sketch the comparison distribution.

E. Explain to someone who familiar with Z not the test?