document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1056845>Question 1056845</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A recent report indicated that 67% of teens 12 to 19 play a video game online at least once a week. How large of a sample would a researcher need to estimate the true proportion of teens 12 to 19 who play a video game online at least once a week within 3% with a 95% confidence level?\r<BR>\n" );
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document.write( "1.) 844\r<BR>\n" );
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document.write( "2.) 4489\r<BR>\n" );
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document.write( "3.) 944\r<BR>\n" );
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document.write( "4.) 4144 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #671947 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=671947\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The SE is z(0.975)sqrt{p*(1-p)/sqrt(n)} and that is equal to 0.03<BR>\n" );
document.write( "1.96*sqrt (0.67*0.33)/n=0.03<BR>\n" );
document.write( "1.96 (sqrt(.2211))=0.03 sqrt (n)<BR>\n" );
document.write( "1.96*0.4702=0.03 sqrt (n)<BR>\n" );
document.write( "multiply on left and square both sides<BR>\n" );
document.write( "0.8494=0.0009 *n<BR>\n" );
document.write( "n=0.8494/0.0009=943.75 or 944.<BR>\n" );
document.write( "Choice 3 </SPAN>\n" );
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