Your groups should be mutually exclusive and collectively exhaustive.
No.
semi stratified sampling
yes
cheese
ang hirap!
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
stratified sampling technique
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).
simple random, stratified sampling, cluster sampling
Stratified sampling
Simple Random Sample Stratified Random Sampling Cluster Sampling Systematic Sampling Convenience Sampling