document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=444839>Question 444839</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can someone please show me how to figure this:\r<BR>\n" );
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document.write( "In a poll of 650 randomly selected high school seniors, 475 plan to attend college for at least 2 years.\r<BR>\n" );
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document.write( "A: Find the sample proportion. -- I got about 73%<BR>\n" );
document.write( "B: Find the margin of error.  -- I don't understand how to do this.<BR>\n" );
document.write( "C: Determine the sample size that produces a margin of error of +-6%.-- I also don't understand how to do this.\r<BR>\n" );
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document.write( "Any help would be greatly appreciated.\r<BR>\n" );
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document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #306561 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=306561\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Can someone please show me how to figure this: <BR>\n" );
document.write( "In a poll of 650 randomly selected high school seniors, 475 plan to attend college for at least 2 years. <BR>\n" );
document.write( "A: Find the sample proportion. -- I got about 73%<BR>\n" );
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document.write( "B: Find the margin of error. <BR>\n" );
document.write( "E = z*sqrt[pq/n]<BR>\n" );
document.write( "E = z*sqrt[0.73*0.27/650]<BR>\n" );
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document.write( "Note: The z-value depends on factors you have not posted.<BR>\n" );
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document.write( "C: Determine the sample size that produces a margin of error of +-6%.-- I also don't understand how to do this.<BR>\n" );
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document.write( "n = [z/E]^2(pq)<BR>\n" );
document.write( "z depends on the level of confidence.<BR>\n" );
document.write( "E = 0.06<BR>\n" );
document.write( "p = 1/2 = q  because you have no information that they are otherwise.<BR>\n" );
document.write( "===================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
document.write( " </SPAN>\n" );
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