document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=317195>Question 317195</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A survey of 144 retail stores revealed that the average price of a microwave was $375 with a standard error of $20<BR>\n" );
document.write( " <BR>\n" );
document.write( "What is the 99% confidence interval to estimate the true cost of the microwave?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #227296 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=227296\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A survey of 144 retail stores revealed that the average price of a microwave was $375 with a standard error of $20\r<BR>\n" );
document.write( "\n" );
document.write( "What is the 99% confidence interval to estimate the true cost of the microwave?<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "x-bar = 375<BR>\n" );
document.write( "---<BR>\n" );
document.write( "ME = invT(0.995 with df=143)*SE<BR>\n" );
document.write( "ME = (2.6106)*20 = 52.21<BR>\n" );
document.write( " <BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "99% CI: 375-52.21 < u < 375+52.21<BR>\n" );
document.write( "====================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "==================  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );