<PRE><B>Question 1177252</B>
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Hi
ME = {{{z*sqrt((p(1-p))/n)}}}
z = 2.576

ME = {{{2.576*sqrt((.28(.72))/1080)}}} = .035


.28 - .035 &lt; {{{mu}}} &lt; .28 + .035

CI: (.245, .315)

Wish You the Best in your Studies.
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