b) it is seen from the data
have 95% confident that the population mean will be within this interval because this means that if you take 100 samples of size 81 in 95%
case the sample mean will fall in this interval
c) let n=required sample size,alpha=0.05
[z(alpha)/2]*(27/n) = 2
(by the question)
z(alpha)/2 can be found
from normal table .
Apr 24th, 2015
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