document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=308541>Question 308541</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find a confidence interval for u assuming that each sample is is from a normal population<BR>\n" );
document.write( "a. x-bar=24,s=3,n=7,90percent<BR>\n" );
document.write( "b. x-bar=42,s=6,n=18,99percent<BR>\n" );
document.write( "c. x-bar=119,s=14,n=28,95percent </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #220689 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=220689\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find a confidence interval for u assuming that each sample is from a normal population<BR>\n" );
document.write( "a. x-bar=24,s=3,n=7,90percent<BR>\n" );
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document.write( "Comment:  I assume you want t-intervals since you are estimating u.<BR>\n" );
document.write( "Since sample size = 7, the degrees of freedom are 6.<BR>\n" );
document.write( "Using a TI calculator I found invT(0.95,6) = 1.9432<BR>\n" );
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document.write( "Find the standard error = E = 1.9432*s/sqrt(7) = 2.2034<BR>\n" );
document.write( "90% CI: 24-2.2034 < u < 24+2.2034<BR>\n" );
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document.write( "Use the same procedure on \"b\", and \"c\".<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( "b. x-bar=42,s=6,n=18,99percent<BR>\n" );
document.write( "c. x-bar=119,s=14,n=28,95percent<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );