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Recently, 18.3% of visitors to the travelocity web site hailed from the google search engine. a random sample of 130 visitors on the travelocity web site was selected. the standard error of the proportion is ________.

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Mindaka
In your problem:
p = 18.3% = 0.183
n = 130

The standard error can be calculated by the formula:
SE = √[p · (1 - p) / n]
     = √[0.183 · (1 - 0.183) / 130]
     = 0.0339

The standard error of the proportion is 0.034.

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