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Transcript
CENTRAL LIMIT THEOREM
(CLT)
STATES: Drawing repeated samples
of size n from any distribution with
standard deviation, α , and mean, U,
will result in a sampling distribution
of X-bar. The sampling distribution
of X-bar will be approximately
normally distributed with mean = to U
and a standard deviation = to α / √n.
The CLT is the basis for the statistical
determination of sample size
(confidence interval estimate):
Sample size n = α2Z2/e2
Where: e= amount of tolerated error
α =standard deviation(estimate)
Z=std. Norm. variate-conf. Intv