Question

1. what is the primary advantage of stratified sampling? a. it eliminates all bias b. it is faster than other methods c. it ensures proportional representation from all subgroups d. it randomly selects entire clusters

Explanation:

Stratified sampling divides the population into subgroups (strata) and samples from each stratum in proportion to its size in the population. This ensures that all subgroups are represented proportionally in the sample. It doesn't eliminate all bias, isn't necessarily faster, and doesn't involve randomly selecting entire clusters.

Answer:

C. It ensures proportional representation from all subgroups