Question: A simple random sample of60items resulted in a sample mean of 25. The population standard deviation is =9. (Round your answers to two decimal places.)

A simple random sample of60items resulted in a sample mean of 25. The population standard deviation is=9.

(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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