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Chapter 10: Sampling Distributions and the Central Limit Theorem
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Table 10-9:
Central Limit Theorem for the DifferenceBetween
Two Sample Proportions
Since for large enough sample sizes, the sampling distribution of the
differences of the two sample proportions will be approximately normally
distributed with a mean of
̂
̂
=
and a standard deviation of
̂
̂
=
√
, we can compute z-scores for observed
̂
̂
values.
The equation that is used to compute the associated z-scores is