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The Mean IQ Score of a Sample of 61 Students

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The mean IQ score of a sample of 61 students selected from a high school is 87.Suppose the standard deviation of IQ's at this school is The mean IQ score of a sample of 61 students selected from a high school is 87.Suppose the standard deviation of IQ's at this school is = 8.4.The 99% confidence interval for the population mean (rounded to two decimal places)is: = 8.4.The 99% confidence interval for the population mean (rounded to two decimal places)is:

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