document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1150403>Question 1150403</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A researcher wishes to determine, within 4%, the true proportion of college males who play video games. A previous study found that 63% of college males had played video games. If she wishes to be 95% confident that her estimate contains the population proportion, how larger a sample will be necessary? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #773055 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=773055\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the half-interval is 0.04<BR>\n" );
document.write( "the half-interval is z*sqrt(p*(1-p)/n)=1.96*sqrt(.63*.37/n)\r<BR>\n" );
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document.write( "set them equal to each other<BR>\n" );
document.write( "square both sides to remove the square root term<BR>\n" );
document.write( "0.0016=3.8416*.2331/n<BR>\n" );
document.write( ".0016n=0.8955<BR>\n" );
document.write( "n-559.67 or 560<BR>\n" );
document.write( " </SPAN>\n" );
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