document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=92338>Question 92338</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A simple random sample is to be drawn from a population of 1200, in order to have 90%confidence that the sampling error in estimating \"n\"is no more the 0.03, what sample size will be necessary?\r<BR>\n" );
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document.write( "P.S. I just ca not get this one and I have tryed. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #67186 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=67186\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A simple random sample is to be drawn from a population of 1200, in order to have 90%confidence that the sampling error in estimating \"n\"is no more the 0.03, what sample size will be necessary? <BR>\n" );
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document.write( "Since E=z'[sigma/sqrt(n)] \r<BR>\n" );
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document.write( "n=[z'/E]^2\r<BR>\n" );
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document.write( "Your Problem:\r<BR>\n" );
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document.write( "n=[1.645*sigma/0.03]^2\r<BR>\n" );
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document.write( "n = [1.645/0.03]^2 *sigma^2\r<BR>\n" );
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document.write( "n = 3006*sigma^2\r<BR>\n" );
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document.write( "Comment: You would have to know sigma to arrive at \"n\".<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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