A simple random sample of 30 items resulted in a sample mean of 10. The population standard deviation is=0. Round your answers to two decimal places. a. What is the standard error of the mean, ? b. At confidence, what is the margin of error?

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A simple random sample of 30 items resulted in a sample mean of 10. The population standard deviation is=0. Round your answers to two decimal places.  a. What is the standard error of the mean, ?   b. At confidence, what is the margin of error?

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