SOLUTION: An advertising firm states that 27% of households will buy something on the Internet next year. How large a sample is needed to be 92% confident that this proportion is within 5% o

Question 1178691: An advertising firm states that 27% of households will buy something on the Internet next year. How large a sample is needed to be 92% confident that this proportion is within 5% of true proportion.
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
What we want is
, and
==>
==>
==>
==>

==> , to 2 d.p.
This then implies to choose a sample with a size of .
(Normal probabilities were taken from https://stattrek.com/online-calculator/normal.aspx.)

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