Question

identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster. a market researcher has partitioned all residents of a certain region into categories (age 0 - 30), middle - aged (age 31 - 60), and senior (over age 60). she is surveying from each category. what type of sampling is used? cluster sampling convenience sampling systematic sampling stratified sampling random sampling

Explanation:

Stratified sampling divides the population into distinct subgroups (strata) based on certain characteristics (here age - 0 - 30, 31 - 60, over 60). Then samples are taken from each subgroup. The market researcher is sampling from each age - based category, which is a key characteristic of stratified sampling.

Answer:

stratified sampling