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Simple Random Sample Stratified Random Sampling Cluster Sampling Systematic Sampling Convenience Sampling
the combinitoin of any random samples is called multistage samplinag. it is the expensive form of cluster samling. when each elements in cluster are expensive then we use multistage sampling.
Simple random sampling.
This would be stratified; the two strata are ages of drivers < 30 & ages of drivers drivers >30.
A cluster is a group of data, or a bunch. A gap is a huge interval. An outlier is a piece of data that is really small or really big.