Identify the type of sample described.

Question

An employee at an animal hospital is keeping track of all of the dogs that are currently in-house and whether they have received their shots. She decides to record all dogs with brown hair first. Identify the type of sample described.

1. self-selected sample
2. systematic sample
3. stratified sample
4. cluster sample
5. convenience sample

Answer 1

This would be a stratified sample, since the employee is sampling off dogs of one strata first. The strata in this case is divided by hair color. Other strata in this population might be all dogs with black hair, and all dogs with white hair.