A personality psychologist is interested in studying the characteristics of people who report being abducted by UFOs. She finds several people in an online support group for UFO abductees who agree to participate in her study and she asks each of them if they can provide the names and contact information of other people who have also been abducted by UFOs. Upon contacting these new participants, she asks them to refer her to even more people they may know who have been abducted. This is an example of what kind of sampling

Cluster sampling

Explanation:

Cluster sampling can be understood as the sampling strategy used in statistics whenever a statistical community has mutually homogeneous but internally diverse groups. It's frequently utilized in market research. The whole population is split into such categories (known as clusters) in just this sampling strategy and a basic randomized representative of the groupings is chosen.

this is an outline for the decisions that frankie is going to make

opportunity cost

willingness to buy

price or quality

of course, there could be many economic strategies that should be considered important while making decision. opportunity cost is the foremost significant factor while considering any economic option. when you buy something, you should know how much you are forgoing for this product. indeed, you could buy something different with this measure if you changed your mind. willingness to buy shows how much surplus you are earning while making a decision. it is important because it shows you buy what you want or you buy because you have only limited amount of money. the price or quality can be considered as a general economic option that we are applying while buying something. when you buy something, price or quality could be one of the options. indeed, they define the characteristics of the product.    

mark brainliest!

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;