Sampling with replacement

Sampling without replacement: In contrast to sampling with replacement, sampling without replacement means that once an individual is selected from a population, they are not put back before making subsequent selections.

Cluster sampling: Cluster sampling involves dividing the entire population into smaller groups or clusters and then randomly selecting some clusters to include in the sample. This method is often used when it is difficult or impractical to sample individuals directly.

Systematic sampling: Systematic sampling involves selecting individuals from a population at regular intervals, such as every 10th person. This method can be efficient and convenient when the population is already ordered in some way.