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A simple random sample of 20 items resulted in a sample mean of 15 , The poputation standard deviation is =9. Round your answers to

A simple random sample of 20 items resulted in a sample mean of 15 , The poputation standard deviation is =9. Round your answers to two decimal places. a. What is the standard error of the mean, y ? b. At 95% confidence, what is the margin of erron

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