document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=313922>Question 313922</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A statistician is considering using a 99% confidence interval for a study instead of a 95% confidence interval.  What happens to the required sample size if the confidence level is increased from 95% to 99% and the same error is required in each case? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #224506 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=224506\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A statistician is considering using a 99% confidence interval for a study instead of a 95% confidence interval. What happens to the required sample size if the confidence level is increased from 95% to 99% and the same error is required in each case?<BR>\n" );
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document.write( "Since n = [zs/E}^2, n is directly proportion to z^2.<BR>\n" );
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document.write( "So, if confidence goes up, that forces z to go up, so n must go up.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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