(Answered) A sample of 245 observations is selected from a normal

Statistics

A sample of 245 observations is selected from a normal population for which the population standard deviation is known to be 25. The sample mean is 20.

(a) Determine the standard error of the mean. (Round your answer to 3 decimal places.)

Standard error of the mean

(c) Determine the 90% confidence interval for the population mean. (Round your answers to 3 decimal places.)

Confidence interval of ___________ and _______________________

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