With seven other homeowners, Marty was invited to a(n) where the researcher asked the group general questions about how they do yard work. The interview revealed that most have limited time to work in the yard and would be willing to hire a lawn care service if the price were reasonable.

The answer is:

focus group

Explanation:

a focus group is a small group of a population, made up of the different categories of the members of the larger population (demographic diversity, whose reactions on particular research are studied using a guided or open discussions, to reflect reliably the reactions that can be expected from the larger population. Use of focus groups is for data collection. In this example, the intended research is on "how homeowners do yard work" and " their views on hiring lawn care services". The group to be focused on (focus group) is the homeowners, so anyone who does not own is home is not part of this group and in order for this group to accurately reflect all the homeowners population, it should include men and women, with different types of homes.

reducing the scale of the market for a new product.