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A simple random sample of 20 items resulted in a sample mean of 20. The population standard deviation is = 2. Round your answers

A simple random sample of 20 items resulted in a sample mean of 20. The population standard deviation is σ = 2. Round your answers to two decimal places.

a. What is the standard error of the mean, ?

b. At 95% confidence, what is the margin of error?

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