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Start Shopping  How to Determine the Confidence Interval for a
Population Proportion   When a characteristic being measured is
categorical — for example, opinion on an issue (support, oppose,
or are neutral), gender, political party, or type of behavior
(do/don’t wear a seatbelt while driving) — most people want to
estimate the proportion (or percentage) of people in the
population that fall into a certain category of interest. For
example, consider the percentage of people in favor of a four-
day work week, the percentage of Republicans who voted in the
last election, or the proportion of drivers who don’t wear seat
belts. In each of these cases, the object is to estimate a
population proportion, p, using a sample proportion,   plus or
minus a margin of error. The result is called a confidence
interval for the population p