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Explanation:
Appalachia (/ˌæpəˈleɪtʃə, -leɪʃə, -lætʃə/) is a cultural region in the Eastern United States that stretches from the Southern Tier of New York State to northern Alabama and Georgia.[1] While the Appalachian Mountains stretch from Belle Isle in Canada to Cheaha Mountain in Alabama, the cultural region of Appalachia typically refers only to the central and southern portions of the range, from the Blue Ridge Mountains of Virginia, southwesterly to the Great Smoky Mountains. As of the 2010 United States Census, the region was home to approximately 25 million people.[2]
Answer: Probabilistic
Explanation: This kind of sample is probabilistic, a random sampling. In this kind of sampling you select a group of students (in this case) among the totality of the high-schools that were randomly selected. This allows the investigation to be more trustworthy and accurate.