a-city-is-divided-into-120120-neighborhoods-after-a-major-flood-twenty-neighborh

Question

A city is divided into 120120 neighborhoods after a major flood. Twenty neighborhoods are chosen at random, and every resident in those neighborhoods is surveyed about their immediate needs. What sampling method is used, and what is a possible source of bias in this approach?

Accepted Answer

Cluster sampling; neighborhoods not chosen may have different needs

Answer

Simple random sampling; no bias is possible

Answer

Systematic sampling; every resident is equally likely to be chosen

Answer

Stratified sampling; all groups are proportionally represented