document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=662752>Question 662752</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 98% confident that her estimate is correct. If the standard deviation is 5.17, how large a sample is needed to get the desired information to be accurate within 0.62 decibels?\r<BR>\n" );
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document.write( "Im off to try and work my other problems..Thanks for your help!  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #412455 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=412455\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 98% confident that her estimate is correct. If the standard deviation is 5.17, how large a sample is needed to get the desired information to be accurate within 0.62 decibels? <BR>\n" );
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document.write( "Since E = zs/sqrt(n)<BR>\n" );
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document.write( "n = [zs/E]^2<BR>\n" );
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document.write( "Your Problem:<BR>\n" );
document.write( "n = [2.326*5.17/0.62]^2 = 377 when rounded up<BR>\n" );
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document.write( "cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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