A sample of 260 observation is selected from a normal population standard deviation is known to be 27. The sample error of the mean is 17
a) Determine the standard error of the mean ( Round your answer to 3 decimal places)
Standard error of mean
b) Determine a 95% confidence interval for the population mean ( Round your answer to 3 decimal places)
A) standard error of mean = sigma / sq.rt (n) = 27/ sq.rt (260) =1.675
b). 95 % confidence interval =. 17 + or minus ( 1.96) (1.675)
= 17 + or - 3.283
Therefore 95% confidence interval =. 13.717 to 20.283
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