document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=639021>Question 639021</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A random sample is selected from a population with µ= 80 and &#963; = 10. To ensure a standard error of 2 points or less, the sample size should be at least __________.<BR>\n" );
document.write( "A) n = 5<BR>\n" );
document.write( "B) n = 10<BR>\n" );
document.write( "C) n = 25<BR>\n" );
document.write( "D) It is impossible to obtain a standard error less than 2 for any sized sample </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #402521 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=402521\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Standard Error: \r<BR>\n" );
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document.write( "SE = sigma/sqrt(n)\r<BR>\n" );
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document.write( "2 = 10/sqrt(n)\r<BR>\n" );
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document.write( "2*sqrt(n) = 10\r<BR>\n" );
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document.write( "sqrt(n) = 10/2\r<BR>\n" );
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document.write( "sqrt(n) = 5\r<BR>\n" );
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document.write( "n = 5^2 \r<BR>\n" );
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document.write( "n = 25\r<BR>\n" );
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document.write( "So the sample size should be at least n = 25 </SPAN>\n" );
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