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A simple random sample of 30 items resulted in a sample mean of 15. The population standard deviation is o = 5. Round your answers

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A simple random sample of 30 items resulted in a sample mean of 15. The population standard deviation is o = 5. Round your answers to two decimal places. a. What is the standard error of the mean, os? b. At 95% confidence, what is the margin of error

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