In June 2012 the Gallup organization conducted a poll using a random sample of 1004 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia. When asked, "On the whole, do you think immigration is a good thing or a bad thing for this country?" 66% responded "a good thing." The news report adds, "For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is ±4percentage points." Based on this report, we can conclude that:

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.