SOLUTION: A sample of 52 observations is taken from a normal population with a standard deviation of 30. The sample mean is 46. Determine the 90% confidence interval for the population mean.

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Question 1141456: A sample of 52 observations is taken from a normal population with a standard deviation of 30. The sample mean is 46. Determine the 90% confidence interval for the population mean. (Round the final answers to 3 decimal places.)

Confidence interval for the population mean is ( )
and ( )
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
the half-interval is for 90% CI is z* sigma/sqrt(n)
or here +/- 1.645*30/sqrt(52)=6.844
the interval is on both sides of the mean or (39.156, 52.844)