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Many states are carefully considering steps that would help them collect sales taxes on items purchased...

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the? Internet? Assume that we want to be 99?% confident that the sample percentage is within five percentage points of the true population percentage for all sales transactions.

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Answer #1

When prior estimate for proprotion is not specified then p = 0.50

Sample size = Z2 * p ( 1 - p) / E2

= 2.5762 * 0.5 * 0.5 / 0.052

= 663.58

Sample size n = 664

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