Q: Who use stratified sampling?

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cheese

They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.

simple random, stratified sampling, cluster sampling

Nothing! there the same

You can't conduct startified sampling if there are no difinative groups, thus systematic sampling is more efficient if your data has no groups.

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No.

it can be used when members of the population are heterogenous

Analyzing 20% of the items that are under $25,000

yes

semi stratified sampling

cheese

They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.

stratified random sampling is a sample(strata) that a same and hemogenieous in group and that a different and heterogenious in group

ang hirap!

The main difference between the quota and stratified sampling is that in the stratified sampling the researcher can not select the individuals to be included in the sample (he doesn't have control over who will be in the simple), but in the quota sampling the researcher has control over who will be in the sample (he can contact certain people and include them in the sample).

stratified sampling technique

simple random, stratified sampling, cluster sampling