Identify the sampling method (simple random sampling, systematic sampling, convenience sampling, cluster sampling, or stratified sampling) in the following study. Researchers studying the use of decongestants select 99 participants between the ages of 20 and 29, 99 participants between the ages of 30 and 39, and 99 participants between the ages of 40 and 49. Question content area bottom Part 1 What type of sampling is used? Stratified sampling Simple random sampling Systematic sampling Cluster sampling Convenience sampling