Identify the sampling method (simple random sampling, systematic sampling, convenience sampling, cluster samplin or stratified sampling) in the following study.
Researchers studying the use of antidepressants select 63 participants between the ages of 20 and 29,63 participant between the ages of 30 and 39 , and 63 participants between the ages of 40 and 49 .
What type of sampling is used?
Systematic sampling
Stratified sampling
Simple random sampling
Convenience sampling
Cluster sampling
Answer
Final Answer: \(\boxed{\text{Stratified sampling}}\)
Step 1 ：The researchers are dividing the population into different age groups (strata) and then selecting participants from each group. This is a characteristic of stratified sampling.
Step 2 ：Final Answer: \(\boxed{\text{Stratified sampling}}\)
