document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1155247>Question 1155247</A>: <I><SPAN STYLE=\"word-break: break-all;\"> estimate the population mean by taking a sample and constructing a 99% confidence interval. \r<BR>\n" );
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document.write( "You know the population standard deviation is 10.97. \r<BR>\n" );
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document.write( "Compute the minimum sample size needed to ensure that your interval estimate has a margin of error less than or equal to 0.8. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #777904 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=777904\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> start with z for 0.995=2.576<BR>\n" );
document.write( "z*sigma/sqrt(n)=0.8<BR>\n" );
document.write( "2.576*10.97/sqrt(n)=0.8<BR>\n" );
document.write( "28.26=0.8* sqrt(n)<BR>\n" );
document.write( "square both sides and divide by 0.64, which is 0.8^2.,<BR>\n" );
document.write( "n=1247.875 or 1248, rounding upward\r<BR>\n" );
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document.write( " </SPAN>\n" );
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