document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1051920>Question 1051920</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a random sample of 64 audited estate tax&#8203; returns, it was determined that the mean amount of additional tax owed was &#8203;$3489 with a standard deviation of &#8203;$2595. <BR>\n" );
document.write( "Construct and interpret a&#8203; 90% confidence interval for the mean additional amount of tax owed for estate tax returns.\r<BR>\n" );
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document.write( "1) The lower bound is &#8203;$?<BR>\n" );
document.write( "2) The upper bound is $? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #667367 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=667367\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The CI is sample mean +/- s/sqrt(n)<BR>\n" );
document.write( "t(0.95,df=63 critical values are |t|>1.669<BR>\n" );
document.write( "90% CI is 3489+/-1.669*(2595/8) since sqrt(64)=8<BR>\n" );
document.write( "the interval is 541.38<BR>\n" );
document.write( "round to 541<BR>\n" );
document.write( "the interval is 3489+/-541<BR>\n" );
document.write( "($2948,$4030) is the 90% CI for the mean. </SPAN>\n" );
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