Question: A simple random sample of 40 items resulted in a sample mean of 20 . The population standard deviation is =7. Round your answers to

A simple random sample of 40 items resulted in a sample

A simple random sample of 40 items resulted in a sample mean of 20 . The population standard deviation is =7. Round your answers to two decimal places. a. What is the standard error of the mean, x ? b. At 95% confidence, what is the margin of error

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