Final answer:
The sampling method described in the study conducted in San Jose is referred to as systematic sampling, which uses a fixed interval between selections after a random starting point.
Step-by-step explanation:
The sampling method used in the study to determine the age, number of times per week, and the duration of residents using a local park in San Jose involves selecting the first house randomly and then choosing every eighth house in the neighborhood for interviews. This method is known as systematic sampling. Systematic sampling is used when a predictable pattern can be applied to select samples. By initiating with a random house and continuing with a fixed interval, it reduces the potential for bias and simulates the randomness of simple random sampling.