document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=873675>Question 873675</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This is a confidence interval question<BR>\n" );
document.write( "A company manufactured a new type of lamp. A sample of 15 lamps is tested and sample mean was to be found 2500 hours and standered deviation is 250 hours,determine 90% confidence interval for mean life of lamp    </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #527017 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=527017\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z = 1.76 at 90%, DF = 14<BR>\n" );
document.write( "ME = 1.76(250/sqrt(15)) = 117.6  0r 118<BR>\n" );
document.write( "CI: 2500-ME < u <  2500 + ME </SPAN>\n" );
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