A randomized clinical trial is designed to study the efficacy of medication “X” to treat attention deficit disorder in individuals. Researchers are interested to make comparisons among different age groups. An initial pool of 1000 subjects (taking medication X) was selected. These subjects were then grouped by age (6-10 yr olds, n=300; 10- 14 yr olds, n= 400; and 14- 18 yr old, n= 300). A random sample of n= 300 was selected as study participants from the three age groups to represent the original distribution of these age groups in the N=1000 individuals. Please identify the type of sampling used in this study. Systematic random sampling Stratified random sampling Simple random sampling

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