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).
Next, how long is a football field? According to the NFL rule book, a field is 360 feet, or 120 yards, long. (By the way, did you know that NASAâs International Space Station is about the size of a football field?o letâs do some math. A person driving at 55 m.p.h. would cover 80.7 feet per second. Multiply that by 5 and the person would drive 403 feet over 5 seconds -- or more than the 300 feet or 360 feet length of a football field.