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Practice

Comparing two proportions

The difference in sample proportions, its standard error for an interval, the pooled proportion and the two-sample z statistic.

Lessons behind these problems

3.10 Constructing a Confidence Interval for the Difference Between Two Population Proportions
3.12 Setting Up a Test for the Difference Between Two Population Proportions
3.13 Carrying Out a Test for the Difference Between Two Population Proportions