2. Stacy is studying the difference in mathematical abilities of students from different high schools. Due to limited resources, she was only able to perform nonprobability sampling. However, she made sure that she got 20 freshmen, 30 sophomores, 30 juniors and 20 seniors in his sample. What type of nonprobability sampling did Stacy use? Your answer 3. A national TV network asked voters which politician they voted for upon exiting their precinct. What method of data collection did the network use?

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