Example
Suppose it is desired to estimate the
server utilization to within with
An initial sample (as shown in (i)) of
size R0=4 is collected. An estimate of
the population variance is
Given ?=0.04, confidence interval =
?The final sample size must be at least
Thus, possible sample sizes R(13, 14, 15,...)
? R=15 and R-R0=11 (additional replications are needed!)
The resulting 95% confidence interval for true utilization ? is
0.779? ? ?0.843
(?0.032 ? ?0.04)