Which expresses 6y : 9y in its simplest form? a. 9 : 6 b. 2 : 3 c. 6 : 9 d. 3 : 2

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected