Identify the type of sampling method used by the researcher in each situation: simple random sampling, systematic sampling, stratified sampling, or cluster sampling.
1. A researcher interviewed all the nurses in each of the 5 randomly selected private hospitals in Northern Mindanao.
2. A statistician selected a sample of ? = 500 high school students from a private school with 2,500 students. He randomly selected the students from each grade level.
3. A Statistics student did a research on the time spent by Grade 11 and 12 students in playing mobile legends. He randomly selected his subjects by using the Table of Random Numbers.
4. A teacher conducted a study in her school to determine who were better in mathematics: the males or the females.
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