Question: Evolutionary theories frequently emphasize the humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking. 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 any other indications of time. They could turn the lights 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?