One factor in determining how many cycles to time in a time study is the degree of variation that is present in the observed times. Why?

Answer: True

Step-by-step explanation:

The Division of the Day and the Length of the 'Hour'

An Egyptian sundial from about 1,500 BCE is the earliest evidence of the division of the day into equal parts, but the sundial was no use at night. The passage of time was extremely important for astronomers and priests who were responsible for determining the exact hour for the daily rituals and for the important religious festivals, so a water clock was invented.