Final answer:
The sampling method described in the question is systematic sampling, where a random starting point is selected and subsequent elements are chosen at regular intervals.
Step-by-step explanation:
The sampling method used in the study described is known as systematic sampling. This approach involves selecting the first element randomly and then choosing every k-th element in the population thereafter. In the scenario for the park in San Jose, the first house was selected randomly and then every eighth house was chosen for the interview process. Systematic sampling is generally easier to implement than true random sampling and can be more convenient when dealing with physical items like houses on a street.