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Transcript 
Estimating Proportions...
We used the proportion of defects in our sample to estimate p, the
true, long-run, proportion of defects.
Could this estimate be wrong?!!
Let p̂ denote the sample proportion.
The standard error associated with the sample proportion
as an estimate of the true proportion is:
r
sp̂ =
p̂ (1 − p̂)
n
34
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