posted by Deborah on .
A simple random sample of 25 has been collected from a normally distributed population for which it is known that 17.0. The saMPLE MEAN HAS BEEN CALCULATED AS 342.0 AND THE sample standard deviation s=14.9. Construct and interpret the 95% and 99% confidence intervals for the population mean.
I don't know what the 17.0 signifies.
95% interval = mean ± 1.96 SEm (Standard Error of the mean)
SEm = SD/√(n-1)
99% interval = mean ± 2.575 SEm