1
You create a list of every member of the population. From the list, we randomly select the first sample element from the first k elements on the population list. Thereafter, we select every kth element on the list.
2
every member of the population is assigned to one, and only one, group. using a probability method (often simple random sampling).
3
sampling refers to any sampling method that has the following properties. The population consists of N objects. The sample consists of n objects. If all possible samples of n objects are equally likely to occur, the sampling method is called simple random sampling. An example of this can be the lottery method
4
the population is divided into groups, based on some characteristic. Then, within each group, a probability sample (often a simple random sample) is selected.
