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A sample of 260 observations is selected from a normal population for which the population standard deviation is known to be 26. The sample mean

A sample of 260 observations is selected from a normal population for which the population standard deviation is known to be 26. The sample mean is 15.

a.

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

Standard error of the mean

c.

Determine the 98% confidence interval for the population mean. (Use z Distribution Table.) (Round your answers to 3 decimal places.)

Confidence interval

and

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