Please use a graphing calculator and list all the steps used on the calculator 1

Question

Please use a graphing calculator and list all the steps used on the calculator

15.     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 90% confident that the sample percentage is within four percentage points of the true population percentage for all sales transactions. (Round up to the nearest whole number).

Explanation / Answer

here as we do not have estimation for proportion; p=.5

margin of errror E=0.04

for 90% CI, z=1.645

sample size n=p(1-p)(z/E)2 =~423

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