Question: A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is 5. Round your answers to two

A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is 5. 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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