document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=959998>Question 959998</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The proportion of public accountants who have changed companies within the last three years is to be estimated within 4%. The 90% level of confidence is to be used. A study conducted several years ago revealed that the percent of public accountants changing companies within three years was 23.\r<BR>\n" );
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document.write( "a.To update this study, the files of how many public accountants should be studied? \r<BR>\n" );
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document.write( "b.How many public accountants should be contacted if no previous estimates of the population proportion are available? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #586713 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=586713\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The proportion of public accountants who have changed companies within the last three years is to be estimated within 4%. The 90% level of confidence is to be used. A study conducted several years ago revealed that the percent of public accountants changing companies within three years was 23.<BR>\n" );
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document.write( "a.To update this study, the files of how many public accountants should be studied?<BR>\n" );
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document.write( "n = [z/E]^2*pq<BR>\n" );
document.write( "n = [1.2816/0.04]^2 *0.23*0.77 = 182 when rounded up<BR>\n" );
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document.write( " b.How many public accountants should be contacted if no previous estimates of the population proportion are available?<BR>\n" );
document.write( "n = [z/E]^2*(1/2)(1/2) = [1.2816/0.04]^2*(1/4) = 257 when rounded up<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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