Question

to conduct a survey about the type of phone service most people in greenville prefer, 10 different blocks in the neighborhood are chosen. on these 10 blocks, 10 houses are selected at random, and then each resident of each of those houses is interviewed. this type of sampling method is simple random sampling. stratified sampling. systematic random sampling. cluster sampling.

Explanation:

1. In simple - random sampling, every individual in the population has an equal chance of being selected directly. Here, blocks are first chosen, so it's not simple - random.
2. In stratified sampling, the population is divided into non - overlapping subgroups (strata) and samples are taken from each stratum. There is no indication of stratification based on relevant characteristics here.
3. In systematic random sampling, there is a fixed sampling interval. No such interval is described in the process.
4. In cluster sampling, the population is divided into clusters (in this case, blocks are clusters), some clusters are selected, and then all or some elements within the selected clusters are sampled. Here, 10 blocks (clusters) are chosen, then houses within those blocks are selected, which is cluster sampling.

Answer:

D. cluster sampling