Confidence interval for the true proportion


1. An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans have brown eyes. A random sample of n=85 C of I students found 34 with brown eyes. Give the numerical value of the statistic p^.
p^=____.

2. A recent survey showed that among 850 randomly selected subjects who completed 4 years of college, 183 smoke and 667 do not smoke. Determine a 95% confidence interval for the true proportion of the given population that smokes.

95% CI:______ to _______.

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Basic Statistics: Confidence interval for the true proportion
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