Question

which of these methods is most likely to be biased?
cluster
systematic
simple random
stratified
convenience

Explanation:

Cluster, systematic, simple random, and stratified sampling are probability sampling methods, which aim to be unbiased by giving each element a known chance of selection. Convenience sampling (selecting easily accessible subjects) is non - probability sampling and often leads to bias as it doesn't represent the population well (e.g., sampling only friends or people in a single location).

Answer:

E. convenience