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Question 155311: Given a normally distributed population, find a 95% confidence interval for the population mean;
sample mean is 119; sample std deviation is 14; sample size is 28
: Given a normally distributed population, find a 95% confidence interval for the population mean;
sample mean is 119; sample std deviation is 14; sample size is 28

Answer by Fombitz(1755) About Me  (Show Source):
You can put this solution on YOUR website!
Confidence interval given std. deviation and mean is,
x +- z*sigma/sqrt(n)
For 95% confidence, z=1.96
x +- z*sigma/sqrt(n)
119 +- 1.96*14/sqrt(28)
119 +- 5.186
(113.8,124.2)