document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=301443>Question 301443</A>: <I><SPAN STYLE=\"word-break: break-all;\"> determine the sample size required to be 95% confident that the percentage of adults who text (claimed to be 22% in a random sample of 135 adults) is in error by no more than 3 percentage points. identify all variable used in your calculation. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #216162 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=216162\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> determine the sample size required to be 95% confident that the percentage of adults who text (claimed to be 22% in a random sample of 135 adults) is in error by no more than 3 percentage points. <BR>\n" );
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document.write( "n = [z/E]^2(pq)<BR>\n" );
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document.write( "n = [1.96/0.03]^2(0.22*0.78)<BR>\n" );
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document.write( "n = 732.46<BR>\n" );
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document.write( "Round up to n = 733<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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