Cluster sampling refers to a type of sampling method . With cluster sampling, the researcher divides the population into separate groups, called clusters. Then, a simple random sample of clusters is selected from the population. The researcher conducts his analysis on data from the sampled clusters.
If you are running around an actual football field (100 yds x 50 yds) a mile would be 5.9 laps (1 mi = 1760 yds/300 = 5.86667). A standard racetrack around a football field should be 440 yds, so 4 laps should be a mile there (1760/440 = 4).
A mile contains 5,280 feet. The standard length of the field used for playing American football is 100 yards, or 300 feet. Dividing 5,280 feet by 300 feet yields 17.6, the number of football fields in a mile. Canadian football is played on a field of a different size, which measures 110 yards, or 330 feet long. A mile could hold 16 Canadian football fields placed end to end.