document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=930151>Question 930151</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I cannot figure this out...\r<BR>\n" );
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document.write( "A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99 percent level of confidence.<BR>\n" );
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document.write( "How large a sample is required? (Round up your answer to the next whole number.) \r<BR>\n" );
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document.write( "  Sample required is .   <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #564714 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=564714\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use the formula n = ( (z*sigma)/E )^2\r<BR>\n" );
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document.write( "where in this case\r<BR>\n" );
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document.write( "n = unknown<BR>\n" );
document.write( "z = 2.576 (found using a calculator; based off the 99% confidence interval)<BR>\n" );
document.write( "sigma = 9<BR>\n" );
document.write( "E = 2\r<BR>\n" );
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document.write( "So,\r<BR>\n" );
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document.write( "n = ( (z*sigma)/E )^2\r<BR>\n" );
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document.write( "n = ( (2.576*9)/2 )^2\r<BR>\n" );
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document.write( "n = 134.374464\r<BR>\n" );
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document.write( "n = 135 ... round UP to the nearest whole number\r<BR>\n" );
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document.write( "Min Sample Size is n = 135\r<BR>\n" );
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document.write( "Jim\r<BR>\n" );
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