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A certain student wanted to estimate the average number of friends people have on Facebook. The student took a simple random sample of 50 out

A certain student wanted to estimate the average number of friends people have on Facebook. The student took a simple random sample of 50 out of all her Facebook friends. She then recorded how many friends each of her selected 50 friends had. Let's assume that the population standard deviation of the number of Facebook friends that people have is 120. What is the margin of error for a 95% confidence interval of the true mean number of Facebook friends for all friends of this student

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