A good example to panel sampling will be sampling the performance of a group of companies in a specified region. This way they the samples can be revisited at a later stage thus panel sampling.
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stratified random sampling is a sample(strata) that a same and hemogenieous in group and that a different and heterogenious in group
You are correct; convenience sampling is not random sampling.
Circular systematic sampling is a random sampling method. An example is random sampling of households. Assume that a random number generator provides the number 49 as a starting point. Starting with the household that is 49 on the target list, every nth household on the list would be sampled until the desired sample size is reached
In stratified sampling, the population to be sampled is divided into groups (strata), and then a simple random sample from each strata is selected. For example, a state could be separated into counties, a school could be separated into grades. These would be the 'strata'.
I think representative is choosing a specific group that represent, for example, your target market. Random sampling is choosing a certain number of random people