A simple random sample of 40 items resulted in a sample mean of 25 The population standard deviation is 5 a What is the standard error of the mean, x b At 95 confidence, what is the margin of error

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

A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is σ = 5.
a. What is the standard error of the mean, σx?
b. At 95% confidence, what is the margin of error?

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