document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=316012>Question 316012</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a microwave oven repairer says that the mean repair cost for damaged microwave ovens is less than $90.  You work for the repairer and want to test this claim.  You find that a random sample of five microwave ovens has a mean repair cost of $68 and a standard deviation of $12. at alpha =0.10, do you have enough evidence to support the repairer's claim.  assume the population is normally distributed </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #226063 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=226063\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a microwave oven repairer says that the mean repair cost for damaged microwave ovens is less than $90. You work for the repairer and want to test this claim. You find that a random sample of five microwave ovens has a mean repair cost of $68 and a standard deviation of $12. at alpha =0.10, do you have enough evidence to support the repairer's claim. assume the population is normally distributed<BR>\n" );
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document.write( "Ho: u >= 90<BR>\n" );
document.write( "Ha: u < 90 (repairer's claim)<BR>\n" );
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document.write( "t(68) = (68-90)/[12/sqrt(5)] = -0.8188<BR>\n" );
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document.write( "p-value = P(t< -0.8188 when df = 4) = 0.2292<BR>\n" );
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document.write( "Since the p-value is greater than 10%, fail to reject Ho.<BR>\n" );
document.write( "The test results do not support the repairer' s claim.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "stan H.  </SPAN>\n" );
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