Social & Preventive Medicine General a7156a0e Which of the following is true regarding sampling? A In simple random sampling the population is divided into strata B Snowball sampling is used for hidden population C Snowball sampling is used for hidden population More sample in systemic random sampling D Cluster sampling is less cost effective High-Yield Explanation Cluster sampling is cost effective. In stratified random sampling the population is divided into strata. Ref: Park, 20th Edition, Page 752