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    Confidene Interval

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    An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight. Over the 400 travelers surveyed, 80 said e-mail access would be worth a slight extra cost.

    Construct a 95% confidence interval for the population proportion of air travelers who are in favor of the airline's e - mail idea.

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    Solution Preview

    The formula for a 95% CI for a proportion is:

    p-hat - 1.96 * sqrt(p-hat * (1 - p-hat)/n) to p-hat + 1.96 * ...