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:

• Simple random sampling: Every individual has an equal chance of being selected directly from the population. Here, blocks are first chosen and then houses, so it's not simple random sampling.
• Stratified sampling: The population is divided into subgroups (strata) and a random sample is taken from each stratum. There's no indication of dividing the population into strata based on some characteristic.
• Systematic random sampling: Selects individuals at regular intervals from an ordered population list. This is not the case here.
• Cluster sampling: The population is divided into clusters (here, blocks are clusters). Some clusters (10 blocks) are randomly selected, and then all individuals (residents of the selected houses in those blocks) within the selected clusters are included in the sample.

Answer:

cluster sampling.