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).
The following two statements describe the relationship between yards and miles: There are 1,760 yards in a mile ; There are 1 / 1,760 = 0.0005681818 miles in a yard ; From the second statement we can deduce the following: If you have 1 yard, then you have 1 / 1,760 miles ; If you have 2 yards, then you have 2 * (1 / 1,760) = 2 / 1,760 miles ; If you have 3 yards, then you have 3 * (1 / 1,760) = 3 / 1,760 miles If we were to generalize this pattern, we see that if you have n yards, then you have: We see that to convert yards to miles, we simply need to divide the number of yards by 1,760. For example, we were wondering how long a football field is in miles. We know that a football field in America is 100 yards long. To figure out how many miles this is, we divide 100 by 1,760. That is: 100 / 1,760 = 0.056818 miles