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May 22, 2015

Homework Help: stats

Posted by liam on Monday, March 28, 2011 at 2:09pm.

A sample of 12 observations is selected from a normal population for which the population standard deviation is known to be 4. The sample mean is 19. (Round your answers to 3 decimal places.)
(a) The standard error of the mean is
The 90 percent confidence interval for the population mean is between and

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