# Random selection

## Random selection is used in experimental research designs

When used in experimental research designs, random selection means that every member of the population of interest has an equal chance of being chosen for participation in the study. Random selection gives the best representation of the diversity that exists with a real population. Random selection is considered a probability sampling method.

Random selection is the cornerstone of experimental research designs. When coupled with random assignment, random selection allows for researchers to establish causal effects. Random selection is necessary for an experimental research design such as the randomized controlled trial. There are several different types of random sampling techniques used in experimental research designs: Simple random sampling, stratified random sampling, and clustered random sampling.

Random selection is the cornerstone of experimental research designs. When coupled with random assignment, random selection allows for researchers to establish causal effects. Random selection is necessary for an experimental research design such as the randomized controlled trial. There are several different types of random sampling techniques used in experimental research designs: Simple random sampling, stratified random sampling, and clustered random sampling.

### Will you be using random selection in your study?

### Random sampling techniques

Simple random sampling is the classic method of randomization where each participant has an equal chance of being chosen for participation in a study.

Stratified random sampling is where the population is broken down into strata based on defined characteristics and each stratum is randomly sampled from.

Clustered random sampling is where specific clusters or subgroups of the population are targeted for random selection so that they can be represented.

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