document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1188542>Question 1188542</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A Computer manufacturer wants to estimate the mean number of defective microchips it produces in a month. From previous study they know that the standard deviation is 10.68.\r<BR>\n" );
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document.write( "What is the required sample size for the manufacturer to be 95 percent confident, that the average defective microchips are within thier industry average with an allowable error of 0.5 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #819673 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=819673\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> error= z*sigma/sqrt (n)<BR>\n" );
document.write( "0.5=1.96*10.68/sqrt(n)<BR>\n" );
document.write( "sqrt(n)=3.92*10.68=41.8656<BR>\n" );
document.write( "n=1753, rounded up. </SPAN>\n" );
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