that a poll has a “margin of error” of ± 3 percent, this is really just the same kind of 95 percent confidence interval that we calculated in the last chapter. Our “95 percent confidence” means that if we conducted 100 different polls on samples drawn from the same population, we would expect the answers we get from our sample in 95 of those polls to be within 3 percentage points in one direction or the other of the population’s true sentiment.
