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Problem 3 There are 300 students in a senior high school. If the margin of error is 10%, how many samples are required? Problem 4 In a certain school, there are 1,200 Grade 11 students. If the margin of error is 5%, what is the appropriate sample size? Problem 5 A study involves 2,000 senior high school students in a city. If the margin of error is 3%, how many respondents should be taken? ACE