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{"ops":[{"insert":"A survey was taken of 800 randomly selected students asking them if they used public transportation to get to class. 120 answered that they did. Construct a 95% confidence interval for this proportion.\n\n1. Please take a piece of paper and write down the process of establishing\u00a0confidence interval\u00a0step by step.\n2. According to past experience, 20% of students took public transportation. Test if the situation changed. Solve the problem step by step.\n"}]}
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