Many companies are interested in knowing the percentage of adults who buy clothing online

| August 30, 2017

Question
Many companies are interested in knowing the percentage of adults who buy clothing online.How many adults must be surveyed in order to be 95% confident that the sample percentage is in error by no more than three percentage points?

Use a recent result from the Census Bureau: 66% of adults buy clothing online.
Assume that we have no prior information suggesting a possible value of the proportion.

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