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Chapter 11: Confidence Intervals – Large Samples
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In order to state a more general approach that can be used to compute the
confidence interval for any population proportion, we need to be familiar
with the notation
, read as “z sub alpha.” This will enable us to use any
number of standard deviations from the mean in constructing the confidence
interval.
Definition:
is a
score such that
area is to the right of the
score value, where
.
Figure 11-3
shows a diagram that explains the notation.
Figure 11-3
: Area associated with