Question

the method of sampling in which universe is divided into number of group and uncertain of items are taken from each group at random​

Answer 1

Stratified Random Sampling

A stratified sample is one that ensures that subgroups (strata) of a given population are each adequately represented within the whole sample population of a research study. For example, one might divide a sample of adults into subgroups by age, like 18–29, 30–39, 40–49, 50–59, and 60 and above......