Which of the following statements correctly distinguishes between a stratified sample and a systematic sample?
A stratified sample selects participants using a predetermined numerical interval, whereas a systematic sample groups the population into distinct strata first.
A stratified sample ensures that subgroups within a target population are represented proportionally, whereas a systematic sample involves choosing every nthn^{\text{th}}nth member of the target population.
A stratified sample guarantees that every individual in the target population has an equal chance of being selected, whereas a systematic sample only selects self-selected volunteers.
A stratified sample is highly prone to researcher bias, whereas a systematic sample relies entirely on the researcher's subjective choice of available participants.
