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Is questionnaire probability sampling technique?
A questionnaire has little to do with sampling technique. Sampling technique is to do with who gets the questionnaire and that can be any sampling technique: the questionnaire can be sent to everyone (census), to a random sample, stratified random samples, to random samples in clusters, by quota or convenience. Or a pile of questionnaires can be left for respondents to pick up - self-selection.
What are the disadvantages of systematic sampling?
Disadvantages of systematic sampling: © The process of selection can interact with a hidden periodic trait within the population. If the sampling technique coincides with the periodicity of the trait, the sampling technique will no longer be random and representativeness of the sample is compromised.
What is a less accurate technique then random sampling?
So-called accidental sampling. Please see the link.
What is the advantage and disadvantage of the convenient sampling?
Convenient sampling refers to using a sample group that is the easiest to gather. The advantage of this is that it is the easiest way to convene a test group. The down side is that the sample may not be representative of the population, so the results will be skewed.
A survey was mailed to a total of 400 students 100 were randomly selected from each of the freshman sophomore junior and senior classes last semester What sampling method was used?
Stratified Sampling Method Stratified sampling is a probability sampling technique wherein the researcher divides the entire population into different subgroups or strata, then randomly selects the final subjects proportionally from the different strata.
