A researcher became interested to estimate the unknown average hours students in a given university spend in the mobile internet on Smartphone. The researcher takes a sample of 12 students in the university. The sample data is given below: 39 42 39 43 47 45 42 45 37 34 33 38 Suppose that the population standard deviation of students spending in the mobile internet on Smartphone is 8. The margin of error for a 95% CI of the population mean is

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