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3. Cross-sectional data Which of the following is true regarding cross-sectional data sets? Check all that apply. The data consist of only one individual, tracked over time. The data are collected at approximately the same point in time. U It can be assumed that the data were obtained through a random sampling of the underlying population. The data consist of a sample of multiple individuals. Suppose you are studying the factors that influence teenage drug use in the United States by conducting several surveys across the United States of teenagers who are in public schools, teenagers who are in private schools, teenagers who are being home schooled, and teenagers who have dropped out of school. True or False: The method you are using to collect your cross-sectional data is an example of random sampling from the entire teenage population within the United States. O True O False